If you're a fan of shirtless celebrities, it's likely you had a very good year. Some of our favorite stars showed off their toned abs and arms over the past 12 months, and we've rounded up the hottest moments for your viewing pleasure. Jon Hamm filmed Mad Men in retro swim trunks, Channing Tatum took a dip in the ocean in Australia before winning his Sexiest Man Alive title, and James Marsden showed off his toned pecs at the beach. There's lots more to enjoy, so click through to see all the best shirtless moments of the year.
Don't miss the rest of our Best of 2012 coverage across the PopSugar Network!