Failed pop stars. "American Idol" reject Pia Toscano is in talks to release a new album after being booted from the talent show. Her foray into pop stardom will probably fare better than these non-musical celebs, who couldn't resist attempting a pop career -- often to ear-splitting effect.

Sued celebrities. Stars are often targets of lawsuits, and it’s up to the courts to determine their validity. The accusations include harassment, failure to pay bills and other no-nos.