Best of 2009

Armed & Dangerous: Biggest Guns of the Year

The hottest accessory in Hollywood? A set of bulging biceps! Take a look at who muscled their way through '09!

ZAC EFRON

Look out Matt Damon, there's a new buff star on the block! The actor is muscling his way out of teen musicals into more adult roles, having recently signed on for a "sexy thriller," according to Hollywood Reporter. "I like backpacking, hiking, surfing, swimming, playing tennis – things that get you active and are also fun," he told PEOPLE.