There are a few famous musicians who do make appearances in the films, like:
* Mini Me (played by Verne Troyer) is a miniaturized clone of Dr. Evil.
* Tom Cruise appears as a fictionalized version of himself in "Austin Powers: International Man of Mystery."
While Ozzy Osbourne isn't in the Austin Powers films, he is known for his iconic rock star persona, which might have made for a fun cameo!