We've all heard about Angelina Jolie's exploits as a United Nations Goodwill Ambassador and Bono's campaigns to combat AIDS and poverty in Africa, but did you know that 'Heroes' star Hayden Panettiere has been fighting to prevent dolphins from being killed in Japan? Or that Jennie Garth is taking on, um, bad breath in Los Angeles? We at PopEater decided to take a look at some of the lesser-known (and often bizarre) causes supported by our favorite celebs.

Jennie Garth and Steve-O, Celebrity Causes