The stars showed off their stockbroking skills buying and selling shares at investment firm Icap, which donated Tuesday's entire revenue to good causes as part of the company's 21st annual global Charity Day.
Other celebrities who helped raise cash included The Saturdays, Peter Andre, Tv presenter Holly Willoughby, and model Cara Delevingne's sister, Poppy.
Even royalty got in on the act - Camilla, Duchess of Cornwall also took to the phones to rally up business.
The proceeds will help 16 different charities, including Alzheimer's Research Uk, the Jls Foundation, Mind and WaterAid.
Last year (12), stars including Goldie Hawn, Alan Rickman and Sean Bean helped raise $16.5 million (£11 million) on Icap's Charity Day.