The 10 Hardest Working Celebrities in Hollywood
3) Travis Barker Aside from
3) Travis Barker. Aside from a reunited Blink-182, his rap-rock group The Transplants and Box Car Racer, this skin-pounder has collaborated with Rihanna, Soulja Boy and Slash, among many, many others. Following his tragic 2008 plane crash, he's definitely making the most of his second chance at life.