It may be George Clooney's birthday tomorrow, but it's his girlfriend Elisabetta Canalis who's stripping down to her birthday suit!


Canalis stripped down to nothing for a new anti-fur ad for PETA -- joining the ranks of Khloe Kardashian, Karina Smirnoff and Taraji P. Henson, who have also gone nude for the cause.

Elisabetta says her aversion to fur started when she was young, after watching a shocking documentary. "I was shocked because I was a little girl, but by that moment I thought that I would never, never, never wear fur in my life."

Her ad will launch this fall -- but check out the sneak peek at the photo shoot above, plus see other stars who've posed for PETA below!


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