Of course our favorite guys look good suited up on red carpets, but when their shirts come off, things really heat up. There were a lot of stars soaking up the sun and showing off their toned abs and arms this year, including David Beckham, One Direction's Harry Styles, and Bradley Cooper. We've rounded up even more for your viewing pleasure, so get clicking, and don't forget to check out the best bikini moments of 2013 too!
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The 35 Sexiest Shirtless Moments of 2013