We've already seen Justin Bieber go head-to-head in a shirtless battle versus One Direction member Harry Styles, but today we're pitting him against his buddy Cody Simpson, who recently showed off his super jacked bod on his Twitter and Instagram account. While both of the teenage crooners look flipping fantastic without their T-shirts, who gets your vote for the hottest shirtless bod?

While he may only be 15 years old, Simpson (who is already pushing 6 feet in the height department) seriously blew us away when he reached a million Instagram followers and in return for his fans' support, treated them to a super hot picture shirtless picture. It's crazy to see a guy so young looking so buff, especially since this is the age when most dudes are in their awkward phase, but he's clearly been working out to enormous results. We can't even imagine what he'll look by the time he hits 18!

Now, on the other hand, we've got Bieber, who despite being three years older than his 'Believe' tour partner, is also a bit shorter. But that isn't to his disadvantage either, since Bieber still looks H-O-T at 5' 7", with toned arms and abs and a leaner figure that a lot of girls drool over. If you check out the picture below too, you can see also see Bieber's ripped abs in a down-to-there pair of swim trunks.

Now, try to keep your jaw-dropping in check when you're looking at these shirtless pics of Simpson and the Biebs, and be sure to vote on the hottest shirtless singer below.

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