Sharon Stone put George Clooney on the auction block Wednesday for a good cause: AIDS research.

Clooney and his Ocean's Thirteen co-stars Matt Damon, Don Cheadle, Andy Garcia and Ellen Barkin made a brief appearance at the annual Cinema Against AIDS dinner, which raised a record $7 million for the Foundation for AIDS Research (amfAR).

As Clooney and his castmates auctioned off a seven-day Mediterranean getaway on a private boat, Stone announced: "If you bid, one of these guys will come down and touch you. And you can choose which one."

But the choice was clear. With flourish - and on stage - Clooney promptly kissed the lucky girlfriend of the winning bidder, who'd ponied up $350,000.

"I'll kiss [Clooney] for $500,000," joked Ellen Barkin. And as dozens of guests clicked their camera phones, Clooney then kissed her, too.

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