Even celebs get tired of their ho-hum, day-to-day existence. So, what do they do? They create alter egos. See if you can match each star to his or her dark side.
When celebrities get bored of their public personas, they often take a page out of this fictional classic that explores the concept of an alter ego. Some -- like this actor, writer and producer -- dress up like the opposite sex. Others -- such as this famous recording artist -- use it to tap into their darker side.

Katy Perry, Miley Cyrus, Rihanna & other artists belted out their hits at the 2010 American Music Awards held at Nokia Theatre L.A. Live on Nov. 21, 2010 n Sunday in Los Angeles.

Miley Cyrus