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Uma Thurman found herself in an unexpected lip-lock at amfAR's 23rd Cinema Against AIDS Gala in Cannes, France, on Thursday.

Thurman was helping to auction off the Victoria’s Secret Fashion Show experience, which included two tickets to brand's annual runway show and a pair of tickets to the exclusive after-party. With a bid of $196,000, Fiat heir Lapo Elkann was declared the winner, and he celebrated by planting a huge smooch on the 46-year-old actress -- all the while keeping his cigarette in hand. However, Thurman's rep told ET that the feelings were not mutual.