The freshly single Elisabetta Canalis celebrates her 33rd birthday today, and she's looking hotter than ever. She may no longer be linking arms with George Clooney, but the model still knows how to rock a slinky gown or a skimpy bikini! Starting with her recent nude shots for Peta's "I'd Rather Go Naked . . ." campaign, check out Elisabetta's hottest moments.