Hollywood celebrated Halloween in a spectacularly over-the-top fashion on Sunday – with a nod to vaccinations, a sizzling red cat and a Mars Attack character at the helm of the looks. 

Katy Perry was the star, and Orlando Bloom was the doctor. Queen of Halloween Heidi Klum, however, wore a wild look and a red wig. Kendall Jenner, who referred to movie history and took a spin on the Tim Burton 1997 scifi classic, upped the sex appeal.    

The Pirates Of The Caribbean star, 44 years old, wrote a caption that read: ‘I vaxed girl and I liked her,’ a reference to Perry’s 2008 song I Kissed A Girl. Heidi, 48, is well-known for her annual party and amazing costumes for the holiday. Heidi looked stunning in her red wig with sexy costume. 

Instagram was not the only one flooded with star costumes; stars were also out and about in West Hollywood with Megan Thee Stallion hosting a host of stars at her fancy dress bash. 

Katy wore a foam syringe costume for their couple costume. Orlando wore a white medical suit and matching Crocs, as well as a blue nurse uniform with his hilarious caption.

Heidi meanwhile has made a case for being the Queen of Halloween ever since she began her annual Halloween bash in 2000 that has become a star-studded event full of elaborate costumes.

Due to the continued dangers of COVID-19 and the large number still unresolved cases, the long-anticipated party of the supermodel has been cancelled for the second year in succession. 

America’s Got Talent judge, however, didn’t let cancellation dampen her Halloween spirit. She still found herself transformed into something else for all to see. 

Queen of Halloween: Heidi went as a sexy cat with elaborate makeup and a pink wig

Queen of Halloween: Heidi dressed up as a sexy cat in elaborate makeup and a pink hairdo

Feeling herself: The German supermodel danced around in furry boots and her skimpy costume

Legs for days: Her long legs were on display

Feeling good: The German supermodel danced in furry boots and a skimpy outfit.

'Mars Attacks! happy halloweeeeeen,' Kendall wrote alongside the series of picture

‘Mars Attacks! Happy Halloweeen,’ Kendall wrote alongside a series of pictures

Classic: Played by Burton's then-girlfriend Lisa Marie, the character is standout from the movie despite never having any lines of dialogue

Pop culture reference: The character was known for chewing a special type of gum throughout the movie

Classic: Burton’s ex-girlfriend Lisa Marie plays the character. Despite not having any dialogue, it is still a standout movie character.

A-listers: Kendall was joined by pals Hailey Bieber, Justine Skye and Lauren Perez

A-listers Kendall was joined by Justine Skye, Hailey Bieber and Lauren Perez

She's got the moves: Kendall certainly nailed the poise of the original character

Going out: The model continued to take her costume into the night as she posted photos on a party bus with friends Hailey and Justin Bieber

She has the moves: Kendall definitely has the poise of the original character 

Kendall Jenner, who played the Martian Girl in Tim Burton’s 1997 warped scifi film Mars Attacks, was another striking transformation. 

Burton’s then-girlfriend Lisa Marie plays the role of the character, which is quite remarkable considering that it has no dialogue. ‘Mars Attacks! Happy Halloweeen,’ Kendall wrote along with the series of photos. 

Olivia Wilde showed off her fake breasts and danced as she transformed Dolly Parton, transforming her with her stuffed bra. 

Olivia dressed up as Jolene and went to the gym wearing a blonde wig, a crop top, and a tie.   

Wow: Megan Thee Stallion ensured all eyes were on her as she hosted a Halloween party in West Hollywood on Sunday

Wow: Megan Thee Stallion ensured all eyes were on her as she hosted a Halloween party in West Hollywood on Sunday

Eye-catching: Tessa Thompson looked incredible in a bright fuchsia top and a frilled skirt which she paired with a colourful blazer

Colourful: The star also sported a gold necklace and matching earrings

Eye-catching: Tessa Thompson looked incredible in a bright fuchsia top and a frilled skirt which she paired with a colourful blazer

Going for it: The actress then took to the treadmill while in fancy dress

Transformation: She was rocking a Dolly look (the country singer pictured)

Ready to work from 9 to 5. Olivia Wilde was seen displaying her fake boobs in Dolly Parton’s style, while Kendall Jenner chose to go as Hollywood celebrates Halloween. 

Funny: Wilde appeared to be giggly as she posed in the video

Funny: Wilde looked giddy as she took part in the video. 

Commitment: The actress showed off her 'Dolly boobs' while getting ready for Halloween

Working it: Olivia really committed to the part

Commitment: The actress showed off the ‘Dolly boobs,’ as she was getting ready for Halloween

Olivia turned heads with her new look. She swapped her honey locks for the voluminous style and mimicked Dolly’s chest with inserts in the large nude bra. 

She matched her striking heels to the yellow shirt and pinned her wig to the side using a red corsage.   

Celebrities tried to be creative with their costumes this year in Hollywood, as well as elsewhere in Hollywood, over the weekend. 

Rebel Wilson and her friends jumped on a hot Netflix trend as they wore their best Squid Games looks while partying with Paris Hilton the night prior. 

Lili Reinhart chose to be a witch and captioned her post with: ‘Celebrating all of my fellow witches today. 

French maid? Hailey looked to dress as a sexy french maid for the evening

Out on the town: Justin Bieber headed out with the group in style and sipped on 818 Tequila

Out on the town Hailey looked radiant in a French maid’s ensemble, while Justin went out with the group in style. He sipped on 818 Tequila.

Halloween party: The niece of Alec Baldwin and her BFF Justine showed off their costumes while heading out in Los Angeles with their friend group

Halloween party: Justine, the niece of Alec Baldwin, and her BFF Justine wore their costumes as they headed out to Los Angeles with their friend group.

PDA: Rebel Wilson transformed into a Squid Game contestant in the wake of the wildly popular Netflix series

PDA: Rebel Wilson transforms into a Squid Game contestant following the success of the Netflix series.

Kourtney Kardashian and Travis Barker have dressed up as Clarence and Alabama from Quentin Tarantino’s 1993 movie True Romance. 

Kourtney (42), and Travis (43), took on the roles Clarence (Christian Slater), and Alabama (Patricia Arquette). They looked every inch the coolest couple for Halloween. 

For fancy dress ideas around the holidays, Tony Scott and Quentin Tarantino have long loved the romantic crime drama. 

Cult classic: Kourtney Kardashian and Travis Barker have dressed up as Clarence and Alabama from Quentin Tarantino's 1993 movie True Romance

Cult classic: Kourtney Kardashian and Travis Barker have dressed up as Clarence and Alabama from Quentin Tarantino’s 1993 movie True Romance

Going all in: Kourtney donned a blonde wig to play Arquette's call girl character Alabama, while Travis covered up his tattoos and wore a wig to play Christian Slater

Going all in: Kourtney donned a blonde wig to play Arquette’s call girl character Alabama, while Travis covered up his tattoos and wore a wig to play Christian Slater

Picture perfect: The couple even posted film poster-like images for the holiday

Picture perfect: The couple even uploaded film poster-like images to the holiday 

True romance: In other images she was seen sliding into the vintage convertible to steal a kiss from Barker

True romance: In other photos, she was seen sliding into a vintage convertible to steal Barker’s kiss. 

Leaning in: She had captioned the series with a long quote from the movie that included the phrase 'you're so cool'

Top down: The movie has become a sort of symbol for the pair and Travis even got the words 'you're so cool' in Kourtney's handwriting tattooed on his hip

 Leaning in: She had captioned the series with a long quote from the movie that included the phrase ‘you’re so cool’

Kylie Jenner was seen enjoying a low-key Halloween hang at Kim Kardashian’s house with Stormi, three-year-old, and Travis Scott.  

Kris Jenner matched her look with a black catsuit that showed off her expanding belly. 

Stormi wore the adorable Ariel costume from Little Mermaid, while the rapper wore the Michael Meyers costume from Halloween.   

Halloween: Kylie Jenner dressed as a simple black cat while celebrating the holiday with beau Travis Scott and daughter Stormi, three at sister Kim Kardashian's Halloween celebration

Mom mode: 'In full mommy mode this halloween i hope everyone has a safe night,' she captioned a post with images of their family-filled day

Halloween: Kylie Jenner dressed up as a simple black cat to celebrate the holiday with Travis Scott and Stormi, three-year-olds at sister Kim Kardashian’s Halloween celebration

Twinning: Kylie and Kris Jenner both twinned as black cats and an image posted showed off her growing baby bump from the side

Twinning: Kylie Jenner and Kris Jenner twinned like black cats, and an image posted showed her growing baby bump from one side. 

Little mermaid: While Kylie channeled a cat, Travis dressed as Michael Myers from the Halloween franchise while Stormi went as Ariel for a celebration at Kim Kardashian's house

Little mermaid: While Kylie channeled a cat, Travis dressed as Michael Myers from the Halloween franchise while Stormi went as Ariel for a celebration at Kim Kardashian’s house 

Daddy's girl: The Houston born rapper cradled his little princess in his arms in another snap

Daddy’s little girl: The Houston-born rapper cradled his little girl in his arms in a second snap

Thriving: A source told People this week that Kylie and Travis 'are doing great' as evident in their sweet Halloween snaps as a family unit

Tender touch: The two looked stronger than ever as he lovingly wrapped his arms around her from the back as they walked

Thriving: People was told this week by a source that Travis and Kylie are thriving, as shown in their adorable Halloween photos as a family unit 

Little mermaid: Stormi seemed to go as a mermaid for the day

Stormi: Stormi appeared to be a little mermaid for that day 

Cat-itude: Kylie showed off her growing belly in a black catsuit and completed the black cat costume with face paint and a set of ears

Growing! Her pregnant belly was on full display in the look and she carried a Judith Leiber bag

Cat-itude. Kylie showed off her growing belly by wearing a black catsuit. The black cat costume was completed with face paint, ears, and a set a ears.

Halloween at home: Khloe Kardashian also went the cat route for the holiday at home as she revealed this week that she is battling a COVID-19 breakthrough case despite being vaccinated

Halloween at home: Khloe Kardashian took the cat route to celebrate Halloween. She revealed this week that she has a COVID-19 breakthrough case and is currently being treated.

Sister Khloe Kardashian went to the cat-friendly route for the holiday at her home. She revealed this week that despite being vaccinated, she is still suffering from a COVID-19 breakout case.

Kim Kardashian revealed nothing about a Halloween costume only after she showed off a metallic space cowgirl type costume. 

She also posted photos of her kids North and Saint, Chicago, and Psalm in their costumes, each showing their unique personalities and interests. 

Space cowgirl! Kim Kardashian did not reveal anything about a Halloween costume until late Sunday evening as she showed off a metallic space cowgirl type of costume

Glam: Additionally the billionaire reality star showed off her expertly done makeup

Space cowgirl! Kim Kardashian didn’t reveal any details about her Halloween costume until Sunday night, when she showed off a metallic space cowgirl costume.

Busty: The SKIMS founder's sexy look included a metallic silver bra and a matching shiny hat

Busty: The SKIMS founder wore a metallic silver bra with a matching shiny cap.

Witchy! Daughter Chicago looked to channel a witch for the day

Truck Driver: Kim's son Psalm went as a truck driver

Photos of our personalities! Psalm was a truck driver, while Chicago’s daughter looked like a witch. 

Serial killers: Eldest daughter North dressed up with her friends in dramatic colored wigs with gothic makeup and carried prop guns while wearing sky high platforms

Serial killers: North, North’s oldest daughter, dressed up with her friends wearing dramatic colored wigs with gothic make-up and high-heeled platforms. 

Roblox: Kim's eldest son Saint went as a Roblox character

Roblox: Saint, Kim’s oldest son, became a Roblox character

Cat woman: Kris Jenner wore Fendi Skims to dress as a cat for the day

Grandma: The Kardashian's grandmother MJ also dressed up as a witch

Kris Jenner dressed as a cat woman in Fendi Skims 

Rebel Wilson faced Squid Game alongside friends including Paris Hilton, who went as princess. 

At a Hollywood bash, she partied with Emma Roberts and Taika Waititi, as well as Demi Lovato.  

Taylor Swift dressed up as a squirrel for the day as she joked ‘can’t talk now I’m on my hot squirrel s**t.’ 

Orlando Bloom and Katy Perry dressed up as COVID-19 vaccine doctors.  

Squid Game: Rebel Wilson attended a star-studded Hollywood bash with the likes of Taika Waititi, Demi Lovato, and Emma Roberts

 Squid Game: Rebel Wilson attended a star-studded Hollywood bash with the likes of Taika Waititi, Demi Lovato, and Emma Roberts

Topical: Rebel and her pals did their version of Squid Games as they posed with Paris Hilton

Topical: Rebel and her friends did their version Squid Games while posing with Paris Hilton

Hot squirrel s**t: Taylor Swift dressed up as a squirrel for the day as she joked 'can't talk now I'm on my hot squirrel s**t'

Going nuts: The oversized costume matched the squirrel's markings and had a giant head with buck teeth

Hot squirrel s**t: Taylor Swift dressed up as a squirrel for the day as she joked ‘can’t talk now I’m on my hot squirrel s**t’

Bloom joked in Bloom’s caption that he had vaxxed a girl, and he liked it. This is a play on Perry’s song I Kissed A Girl.  

Jamie Lee Curtis shared a sentimental image of herself as a child and explained that her costume was a little Dutch girl.

Jamie wrote that she was excited to see what people would wear this year. ‘Love and missed to my mother Janet Leigh, OG SCREAM QUEEN! 

Baby Yoda: Vanessa Hudgens and her boyfriend Cole Tucker attended the Outsidelands music festival in San Francisco and went as Baby Yoda

Smooches: The actress and her MLB beau engaged in some sweet PDA

Baby Yoda: Vanessa Hudgens accompanied by Cole Tucker to the Outsidelands music festival in San Francisco. They went as Baby Yoda

She was clearly referring to Janet Leigh her mother, who starred as Psycho in Alfred Hitchcock’s horror classic.

Recognise them? Sarah Michelle Gellar and husband Freddie Prinze Jr. do Dirty Dancing

Recognize them? Sarah Michelle Gellar, husband Freddie Prinze Jr., do Dirty Dancing

Nobody puts Buffy in the corner: The star and her husband recreated an iconic scene from the classic film

Buffy isn’t in the corner. The star and her husband recreated a famous scene from the classic film.

Goofing around: The married couple did their best to recreate the seen

Come hither: Freddie played the part of Johnny

Joking around: The married couple tried their best to recreate the scene. 

Witchy: Riverdale star Lili Reinhart dressed up as a witch for Halloween

Riverdale star Lili Reinhart dressed in a witch costume for Halloween

Huh? Joe Jonas and wife Sophie Turner looked liked bloodied burglars for the night

Huh? Huh? 

Ferocious feline! Sofia Vergara went as a tiger

Ferocious feline! Sofia Vergara became a tiger 

Movie magic: January Jones went as Angelica Graynamore from the film Joe Versus The Volcano

Movie magic: January Jones went as Angelica Graynamore from the film Joe Versus The Volcano

Jamie recently dressed up as her mother for the premiere of Halloween Kills. 

Sarah Michelle Gellar recreated a scene from Dirty Dancing at her home with her husband Freddie Prinze Jr. 

She captioned the picture, “Nobody puts Baby in the Corner #happyhalloween From Baby Houseman And Johnny Castle #dirtydancing#loverboy,” 

Looking for Gomez: This year, Cardi B got dressed up as Morticia Addams

Looking for Gomez – This year, Cardi B dressed as Morticia Addams 

Revealing: The rapper certainly put a racy spin on the Addams Family matriarch

Revealing – The rapper sure put a racy spin to the Addams Family matriarch 

Gotchi couture: Cardi's gown was designed by Natalia Fedner

Gotchi couture: Natalia Fedner designed Cardi’s gown 

Matching: Cardi also did a mommy-daughter costume with Kulture as they went as witches for the day

Matching: Cardi wore a mommy-daughter outfit with Kulture, as they dressed up as witches for Halloween

Spellbound: 'We put a spell on you and now you're ours!' she captioned the photos

Spellbound: ‘We cast a spell on your and now you are ours! She captioned the photos 

Sassy: The three-year-old daughter she shares with Offset showed off her personality

Sassy: Offset’s three-year-old daughter, she shares with her, showed off her personality 

Closeup: A closeup look at the black velour gown and accessories can be seen

Closeup: The black velour gown can be seen with accessories. 

Rick James: Cardi's rapper husband Offset went as Rick James for Halloween

Rick James: Offset, Cardi’s husband and rapper, went as Rick James to celebrate Halloween 

Nailed it: His Rick James costume seemed to move Cardi to hysterics as she reposted the video with emojis

It was perfect: Cardi was hysterical as she re-posted the video with emojis in his Rick James costume 

Cardi B chose Morticia Addams of The Addams Familie, wearing a Natalia Fedner gown. 

The rapper was seen striking a variety of stunning poses in the all-black gown, while holding a red Rose. 

Cardi’s famous curves were exposed by the transparent mesh material as she got into character. 

Kulture also wore a mommy-daughter outfit as they were dressed up as witches.  

Elaborate: Ariana Grande, 28, went all out for her Halloween costume this year

Elaborate: Ariana Grande, 28, went all out for her Halloween costume this year

Incognito: The petite songstress was unrecognizable in green body paint and prosthetics as she portrayed the monster from the 1954 horror film Creature from the Black Lagoon

Incognito: The tiny songstress was disguised as Creature from the Black Lagoon’s monster in Creature from the Black Lagoon’s 1954 horror film Creature from the Black Lagoon.

Playful: Taking to a body of water, the imaginative star made a splash for the promo shot, and in another snap she sipped from a glass of wine

Playful: Taking to a body of water, the imaginative star made a splash for the promo shot, and in another snap she sipped from a glass of wine

Helping hand: Helping out with the festive effort was the singer's husband Dalton Gomez, 26, whom she enlisted in the role of 'handsome scuba man'

Helping hand

Meanwhile, Ariana Grande, 28, went all out for her Halloween costume this year.

The tiny songstress was disguised in green body paint and prosthetics, as she played the role of Creature from the Black Lagoon, a 1954 horror film.

Dalton Gomez (26), the singer’s husband, helped out with the festive effort.

'Be safe everyone': Jamie Lee Curtis posted a heartfelt message for Halloween looking back on her childhood

Jamie Lee Curtis posted a heartfelt message to Halloween that said “Be Safe Everyone” and looked back at her childhood. 

Horror icons: Jamie also posted this picture with her mother, Psycho star Janet Leigh

Horror icons: Jamie also posted this photo with Janet Leigh, Psycho star Janet Leigh

Madonna: For the day Madonna showed off a very black costume and shielded her face with the caption 'nowhere is safe'

Madonna: Madonna wore a black dress and shielded her face in a caption that read ‘nowhere’ 

Cheetah girl? Gwen Stefani looked to channel a cheetah with a two toned wig and expert makeup

Cheetah girl? Gwen Stefani wanted to channel a Cheetah girl, so she wore a two-toned hairstyle and expert makeup 

Ashley Tisdale and her daughter Jupiter teamed up, dressed as characters from Where the Wild Things Are. 

High School Musical actress Jupiter wore a pink and white striped long-sleeve sweater as she held Jupiter, her baby girl. Jupiter wore a onesie with a silver crown just like Max.  

Rihanna donned the role of rapper Gunna and shared side-by side photos with him as a reference point. 

Andy Cohen and Benjamin, his son, went trick-or-treating dressed up as astronauts while Pink and Carey Hart dressed up as a family with their children. 

Getting in character: Rihanna dressed up as rapper Gunna as she shared side by side photos with the rapper as a reference point

Getting in character: Rihanna dressed up as rapper Gunna as she shared side by side photos with the rapper as a reference point

Same energy: Rihanna nailed the rapper Gunna (pictured above) and his look with identical wardrobe and braids

Same energy: Rihanna nails Gunna (pictured below) and his look featuring identical hairstyles and braids 

Fun and games: The Savage x Fenty mogul recreated a series of images the Drip Too Hard rapper posted recently

Fun and games: The Savage x Fenty mogul recreated a series of images the Drip Too Hard rapper posted recently

Fun and games: The SavagexFenty mogul recreated a series images that Drip Too Hard posted recently

A wild mother: Ashley Tisdale and her daughter dressed as characters from Where the Wild Things Are

Ashley Tisdale, a wild mother, and her daughter dressed up as characters from Where the Wild Things Are

Beautiful baby: Tisdale's baby was dressed as the main character Max from the book

Beautiful baby: Tisdale’s baby was dressed like Max, the main character in the book

Trick or treat! Andy Cohen and his son Benjamin went as astronauts

Trick or Treat! Andy Cohen and Benjamin Cohen, his son, were astronauts. 

Candy hunt: The father son duo walked hand in hand for some trick or treating in the West Village

Candy hunt: The father-son duo walked hand-in-hand in the West Village for trick or treating

Ghostbusters! Nick Cannon and his girlfriend Abby De La Rosa went as Ghostbusters

Ghostbusters! Ghostbusters! Nick Cannon and Abby De La Rosa, his girlfriend, went with him 

Newborns: Also dressed up like their parents were their newborn twin boys Zion and Zillion

Newborns: Their twin brothers Zion and Zillion, also dressed up as their parents, were also dressed up.

Another snap: The couple really got into Ghostbusting character in matching suits like those worn in the classic film

Another snap: The couple got into Ghostbusting character in matching costumes like the ones worn in the classic film. 

Duck duck goose! Mandy Moore's son August 'Gus' dressed up as a goose

Duck duck goose! August ‘Gus’ Moore, Mandy Moore’s son, dressed up in a goose costume

Family costume: Pink, her husband Carey Hart and their two children did a family costume

Family costume: Pink, Carey Hart, and their two children wore a family costume

Spooky vibes: Pink used a filter that created a smokey effect as she sipped a cocktail

Spooky vibes: Pink used an effect filter to create a smokey effect while she sipped on a cocktail 

Amy Schumer, comedian, chose to be a Tampax Tampon instead. 

She captioned the photo with “Nothing will stop” and joked about her hysterectomy, saying, “I don’t even have a uterus but I can still wear Tampax.”

Shawn Mendes and Camila Caello, power couple, wore traditional Dia de los Muertos close. 

Coco Austin and Ice-T dressed up as Harley Quinn and The Joker for the bash. 

Joking around: In an Instagram video she posted Amy Schumer joked about her hysterectomy saying, 'I don't have a uterus, but nothing will stop me from wearing Tampax'

Joking around: In an Instagram clip, Amy Schumer joked about her hysterectomy, saying, “I don’t even have a uterus. But nothing will stop me wearing Tampax.”

Another important day: Camila Cabello and Shawn Mendes dressed in traditional clothes of Dia de Los Muertos

Camila Cabello and Shawn Mendes, dressed in traditional Dia de Los Muertos clothing, mark another important day

All out: The couple went all out with their hair, makeup and costumes

All out: The couple went all out for their hair, makeup, and costumes 

Joking around! Coco Austin and husband Ice-T went all out for a bash as well as they dressed as Harley Quinn and The Joker

Joking around! Coco Austin and Ice-T had a great time at the bash. They dressed up as Harley Quinns and The Joker.

Party time: The couple attended a themed party on Saturday evening

Party time: On Saturday evening, the couple attended a themed party 

Sexy: The model's killer curves were on display as well as her enhanced chest

Sexy: The model was sexy and showed off her killer curves as well as her larger chest. 

Villainous: Both looked to pull off the Suicide Squad couple's costume and used props

Villainous. Both looked like they were wearing the Suicide Squad couple costume and using props 

Goodfellas! Olivia Rodrigo went as Michelle Pfeiffer's character in Goodfellas Elvira Hancock

Changes: MIchelle is pictured in the 1983 movie

Goodfellas! Olivia Rodrigo went as Michelle Pfeiffer’s character in Scarface Elvira Hancock 

Nailed it: The Drivers License singer sported a silky blue dress and a blonde bob

It was perfect: The Drivers License singer wore an elegant blue dress and a blonde hairstyle. 

Olivia Rodrigo portrayed Michelle Pfeiffer’s character Goodfellas Elvira Hancock, complete with a silky blue dress & blonde bobwig. 

Pepper, Chrissy Teigen’s mom, dressed up as Kris Jenner to celebrate Halloween. The result was hilarious and included a Kylie lipkit.  

Lupita Nyongo dressed up as a banana and Heather Graham donned a Day Of The Dead outfit with a skeleton onesie, a floral headpiece, and a skeleton shirt. 

Christina Haack and Eiza Gonzalez, on the other hand, shared glimpses of their day. 

Full look: Chrissy Teigen went as Chiquita Banana

Full look: Chrissy Teigen went as Chiquita Banana

Doing a double take: Chrissy Teigen's mom Pepper dressed as Kris Jenner

Doing a double take: Chrissy Teigen and Pepper’s mom dressed as Kris Jenner

Stunning: The Cravings founder's look also included loads of bananas and a sexy set and headwrap

Festive: Chrissy showed off her elaborate costume while her mom Pepper showed off her full Kris Jenner look with a mink coat and Birkin bag

Festive: Chrissy displayed her elaborate costume while Pepper showed off her full Kris Jenner look, complete with a Birkin bag, mink coat, and Birkin jacket

Last minute! Riley Keough confessed to throwing together a 'last minute hocus pocus' costume

Last minute! Riley Keough admitted that she had put together a ‘last-minute hocus-pocus’ costume.

A-peeling! Lupita Nyong'o dressed up in a banana suit

A-peeling! Lupita Nyongo in a banana suit 

Humorous: The Twelve Years A Slave star chose to go a humorous route for the holiday

Humorous: Twelve Years A Slave’s star chose to take a humorous route for the holiday

Scream: Courtney Cox showed off her stylish costume and joked 'when your guests unexpectedly show up as the Scream cast'

Scream: Courtney Cox showed her elegant costume and joked that she was ‘when your guests suddenly show up as the Scream cast’

Themed: Mindy Kaling showed off a sweater with ghosts and drew cobwebs under her eyes

Themed: Mindy Kaling wore an oversized sweater with ghosts and drew spiderwebs under her eyes 

Dia De Los Muertos: Heather Graham was seen in a skeleton catsuit with pink flowers on her head

Dia De Los Muertos. Heather Graham was photographed in a skeleton suit with pink flowers on the head 

Dog costumes: Graham posted two snaps of her dogs in full costume

Graham posted two pictures of her dogs in their full costumes as dog costumes 

Baby shark: Heather's other dog was seen in a shark costume

Baby shark: Heather’s other dog was also seen in a shark costume 

Playing around: Eiza Gonzalez played around with a devil filter as she wished her followers a Happy Halloween

Playing around: Eiza Gonzalez tried out a devil filter to wish her followers a Happy Halloween

Lowkey: Christina Haack also posted a photo with her fiance Josh Hall and young son Hudson

Lowkey: Christina Haack also posted an image with Josh Hall and Hudson, her fiance.

Festive: Lupita had showed off her expert pumpkin carving skills earlier

Festive: Lupita had already demonstrated her pumpkin carving skills earlier