Moulin Rouge hunk Ewan McGregor made the cast and crew of his new movie turn bright red when he waltzed around the set totally nude! Most actors demand a closed set if they have to strip for the camera -- but not Ewan. He roamed around stark-naked even after his scenes were over! "He's certainly not embarrassed by his manhood," says an eyewitness on the set of Young Adam, the thriller he's filming in Scotland. "And he definitely shouldn't be."