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Sharon Stone, Kate Moss

Ramey Photo

It was totally sexy—and for a good cause.

Looking stunning in a formfitting red dress, Sharon Stone locked lips with supermodel Kate Moss as part of a charity auction on Friday at the Third Annual amfAR Inspiration Gala in Sao Paulo, Brazil.

Why (as if we needed a reason)? Stone, 55, and Moss, 39, served as co-hosts for the event, which raised money for AIDS research, and the sexy smooch was a demonstration: A kiss from Moss was part of a package that also included a special gold-laminated bottle of Moet & Chandon champagne, which the duo also autographed.

The lip-lock must have worked: The package sold for a whopping $53,529.