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Well not his REAL birthday suit, but he was celebrating his (early) 49th at Nobu last night, so Sean Penn was dressed in his b-day best.

Though the Oscar winner attempted to go unnoticed, photogs were still able to snap some shots of him. He's been in this biz long enough to know that he can't outrun the paps, so why bother pulling stunts like this? Maybe he was in a hurry to get home to Robin? Or perhaps another lucky lady?

P.S. Is birthday boy Sean still sizzling hot? Or about as appetizing as Mickey Rourke?