PALM DESERT, Calif. -- Brad Pitt has a sense of humor about the bumper sticker George Clooney slapped on his car that said he was a gay voter with a small penis.

Pitt said he's "very proud of being a gay voter" and that he doesn't think his "small penis is something to be ashamed" of.

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Video: Preview: 'Ocean's Twelve'

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The bumper sticker was in retaliation for a fake memo Pitt sent to the cast and crew of "Ocean's Twelve" saying that Clooney was insisting on being called by his character's name and that no one was allowed to look him in the eye.

Matt Damon, who is also in the film, told Cosmo that Pitt drove through rush hour in Los Angeles without knowing why people were looking at him and waving.

Pitt also said he didn't need to do any preparation for his kissing scenes with Catherine Zeta-Jones in "Ocean's Twelve." Pitt said "it was pretty natural. Pop a mint and off you go."

Pitt said the great thing about Zeta-Jones is that not only is she beautiful, "she'll drink every one of you under the table."

"Ocean's Twelve" opened Friday.