The future sister of Lady Amelia Spencer has been photographed in public, her first since being fired from teaching under the shadow of an infamous sex scandal.

South African model-turned-history teacher Fiona Viotti, 32, was pictured in London at the weekend with her brother Greg Mallett and his fiancée Lady Amelia, niece of Princess Diana.

Ms Viotti resigned suddenly from exclusive £16,000-per-year Bishops Diocesan College in Cape Town in 2019, after an 18-year-old student came forward to say he was in an ‘intense’ sexual relationship with her.

Fiona was exposed in explicit videos and shared online and around all-boys college. A subsequent investigation by school found that Fiona had been having sexual relations with five boys during 2013 through 2019. 

Lady Amelia, a Storm Agency Model and 29-year old sister posted images of Greg (nicknamed Grizzle), as she walked around Borough Market in South London over the weekend.

She commented: ‘The best time with my @Gregmallett @fionam1405’.

Lawyer William Booth who acted for Viotti told MailOnline: ‘There are no matters outstanding against her, no negative findings have been made against her, she is free to get on with her life including teaching or working with school-aged children.’ 

South African model-turned-history teacher Fiona Viotti, 32, was pictured in London at the weekend with her brother Greg Mallett and his fiancée Lady Amelia, niece of Princess Diana

South African model-turned-history teacher Fiona Viotti, 32, was pictured in London at the weekend with her brother Greg Mallett and his fiancée Lady Amelia, niece of Princess Diana

Her brother Greg, a former water polo teacher, now an estate agent, announced his engagement to Lady Amelia Spencer, daughter of Charles, Earl Spencer, last year (pictured)

Greg Spencer was her brother, and is now an estate agent. 

After parents refusing to let their children cooperate, the investigation failed to lead to any criminal prosecutions.

Fiona, who had married venture capitalist Pavo Viotti barely a year earlier, also split from her husband, according to sources, and was said to have sought ‘medical help’ after the scandal.

Greg Spencer was her brother, and is now an estate agent.

Greg and Fiona’s father Dave Mallett is a former coach of the Springboks South African national rugby team and is still a history teacher at Bishops.

In the snaps, which were shared by Lady Amelia on Instagram, Greg can be seen exploring Borough Market with his sister

In these snaps that Lady Amelia shared on Instagram, Greg is seen walking around Borough Market with his sister. 

Fiona may have worked as an online tutor after the scandal that ended her career as a teacher of history and coach in water polo at the school’s top school.

South African Council for Educators closed the file last year on its probe into Viotti’s sexual misconduct. It concluded that Viotti was involved in sexual misconduct between 2013 and 2019.

SACE said, referring to the pupil whose claims led to the scandal: ‘The learner in question, through his legal representative, indicated that he would not be participating in any interview with SACE.

‘On that note, we had to submit our final report on the 3rd December to have the matter closed on the basis of lack of cooperation by witnesses. We are now closing the file and will notify the parties accordingly.’

Following the scandalous allegations, Bishops’ former teacher left and sought medical attention. She also divorced.

Posting another snap of her future husband and sister-in-law, Amelia said she 'had the best time' with the brother and sister duo

Amelia shared another picture of her sister-in-law and husband, and stated that they had the most fun together.

A team of lawyers was appointed to examine the case and find that the student had broken both the SACE and school codes of conduct.

Outlining the claims against Fiona at the time, one of the boys’ parents told the IOL news site: ‘He was a willing participant in the beginning but became a victim when he couldn’t get out of it.

“The teacher had started to text him asking him to go to her place on campus. It was that way it began, but it escalated to the point where it became unbearable.

“But, the teacher refused to let him go. He went to his parents to get help. They went to the headmaster. Now it’s all out.

Bishops Diocesan College is one of South Africa's most prestigious schools, with alumni including astronaut Mark Shuttleworth and South African cricket star Herschelle Gibbs

Bishops Diocesan College is one of South Africa’s most prestigious schools, with alumni including astronaut Mark Shuttleworth and South African cricket star Herschelle Gibbs

South African Police Service has not been implicated as no criminal charges have been filed against the boy who whistled the alarm. The schoolboy involved was aged two years beyond the legal age.

A school source said: ‘It would appear this is not a criminal matter but one of gross misconduct between a teacher who has stepped over a clear line and it is a matter for the school to handle.’

Contacted by MailOnline, Ms Viotti’s lawyer William Booth confirmed that no charges had been brought against his client. 

Amelia and Greg first met while studying at the University of Cape Town and he reportedly popped the question at the Clouds Wine and Guest Estate, a place that boasts being ‘situated on one of the world’s most beautiful mountain passes’ in Stellenbosch, South Africa.

Officials at the £16,000-per-year school believed that several boys were involved in relationships with the teacher over a number of years

Officials at the £16,000-per-year school believed that several boys were involved in relationships with the teacher over a number of years

Viotti - the niece of former South Africa rugby coach Nick Mallett - was a history teacher, but also coached the water polo team (pictured)

Viotti (the niece of South Africa Rugby coach Nick Mallett) was a teacher in history and also coached water polo teams (pictured).

Lady Amelia is one of Earl Spencer’s seven children, and a first cousin of Prince William and Prince Harry.

She has an older sister, Lady Kitty. Also, she has a twin brother, Louis Spencer Viscount Althorp.

With their mother Victoria Lockwood and father John Lockwood in 1995, they moved to Cape Town.

Following Charles and Victoria’s divorce in 1997, Charles relocated back to the UK and has subsequently remarried on two occasions.

Lady Amelia is one of Earl Spencer’s seven children, and a first cousin of Prince William and Prince Harry (pictured with Greg)

Lady Amelia is one of Earl Spencer’s seven children, and a first cousin of Prince William and Prince Harry (pictured with Greg)  

Lady Amelia and her sister Lady Eliza moved to London earlier this year and have taken the city by storm, attending various prestigious events

Lady Amelia, along with her sister Lady Eliza, moved to London in the spring. They have been a huge success and attended many prestigious events.