Damien Hirst has painted an Audi A1 car to be sold at tomorrow's White Tie and Tiara ball.
Elton said: ''This is one of the most exciting auction items we have ever had for White Tie.''
As part of the same lot, the vehicle will be auctioned with a 6ft diameter canvas spin painting, which Hirst completed at the same time.
The A1 will not be seen on UK roads until November, and the special artwork was created ahead of the car's mainland European launch dates.
Audi UK director Jeremy Hicks said: ''We are enormously proud to support Sir Elton John's remarkable fundraising ball for the eighth year in succession with the donation of a priceless and unrepeatable work of art for auction.''
The White Tie and Tiara hosts are seen, below, with the A1.