The Girls Aloud singer and the former Olympic track cyclist were among the well-heeled London set who shopped till they dropped at Shop Wear Care.
The event saw shoppers get their hands on designer clothing to help raise money for the children's charity; 100 per cent of the profit went to the charity.
Nicola Roberts was spotted shopping at the designer event
British brands who set up shop and donated their collections included Rachel Riley – who has famously dressed Prince George in the past – and other labels that the Duchess of Cambridge loves, including Alexander McQueen, Emilia Wickstead and ISSA.
Nicola, 31, was spotted browsing the stalls and showing off her own sartorial style in a seventies-inspired look.
Victoria opted for an all-black outfit, looking chic in a blazer, trousers and turtleneck top.
Victoria Pendleton also made an appearance at the charity fundraiser
Money raised at the Claridges-based event will help Great Ormond Street provide world-class care for young patients and their families.
This includes pioneering new treatments, providing cutting edge equipment and supporting the redevelopment of the hospital to provide state-of-the-art facilities to match the hospital's world-class care.