The most popular mens' accessory of the year? A set of killer abs. Austin Mahone, Justin Bieber, One Direction, Cody Simpson, Ross Lynch and more of our favorite dudes spent a good portion of 2013 shirtless and flaunting their six-packs.
And we're assuming they also spent a lot of time at the gym this year to get that ripped. But all of their hard work has paid off because they earned a spot on our list of the most impressive abs of the year!
Click through the above slideshow to find out who made the cut. Who do you think has the best six-pack of 2013? Vote in the comments.