After a date, all eyes were focused on Jeff Bezos, Amazon founder and Lauren Sanchez.
American former news presenter Miss Sanchez, 52, wore a pleated drop-waist dress by Alaia, which costs £2,590 in Harrods.
Mr Bezos, 58, who is worth £120billion, chose a short-sleeved top and blue trousers.
Former news presenter Lauren Sanchez wore an Alaia dress which costs a hefty £2,590 at Harrods. Meanwhile £120bn man Jeff Bezos wore a simple grey polo and blue trousers
They were on holiday in London and enjoyed a private tour at Buckingham Palace.
Earlier in the week, Miss Sanchez paired a white minidress with a £14,000 diamond teardrop necklace and a large £9,500 evil eye pendant, both from high-end designer Jacquie Aiche.
Then, Mr Bezos was wearing a pair of white £600 Brunello Cucinelli jeans.