February 3, 2011 - Michael Buckner/Getty Images North America more pics like this »
1. Justin Timberlake - 'N Sync

Justin Timberlake soared into the spotlight as a member of NSync (and Britney Spears' boyfriend) in the '90s, and he's somehow managed to keep stay relevant over all these years. He actually might be more popular now than ever before, after launching his solo music career then transitioning to acting. His flicks now include Alpha Dog and the wildly successful The Social Network. He has four new flicks in the works for 2011. He's also dating actress Jessica Biel, though they can't seem to escape the breakup rumors.