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Joe Jonas, Nick Jonas

Snapchat

The thirst traps have been set.

Joe Jonas and Nick Jonas seem to be in an unofficial shirtless selfie competition. While neither brother has thrown the gauntlet (publicly, at least), the Jonases have, in recent weeks, been keen on showing off their famously fit bodies via social media. In fact, rarely a day goes by where one of the siblings isn't working out and sharing his progress on Snapchat and Instagram.

Nick snapped a topless picture in the mirror Thursday, writing, "Play hard. Work harder." Two days earlier, the Jumanji actor's Snapchat story showed fans what a typical "chest day" entails. Joe, meanwhile, showed off his huge back muscles in a selfie taken eight weeks ago in Chicago.

Nick Jonas

Snapchat

Like Joe, Nick finds time to exercise no matter where he is. "You've got to get creative on the road," he said in the Honda Civic Tour: Future Now Diary's sixth episode. "There are a lot of different scenarios you can be in where you don't have the tools you usually have. Thankfully, I do a lot of different styles of training, whether it's boxing...or actually hitting the weight room."

Clearly, the Jonases are comfortable in their own skin—and they're the first to tease each other about it, like when Joe mocked Nick during a recent Reddit AMA session. "Nick's nipples are not as big as they may appear. It did take multiple surgeries to get them down to a normal size," the pop star joked. "I think it was like 30-40 surgeries to just get them to a little quarter shape."

Joe Jonas

Instagram

Later, when a fan asked if it's true that Joe has the biggest penis of his siblings, the DNCE singer replied, "I like to think so. Although, it's not often that I'm in a locker room or shower with my brothers, so I couldn't really tell you. But, I'd like the Internet to believe that I'm still killin' it." Nick, who did not participate in the Reddit AMA, has not publicly debated the Reddit question.

Regardless, their shirtless selfies have become quite popular on social media. And judging by the number of likes they got, it doesn't look like either plans to quit posting them anytime soon.

Your move, Kevin Jonas.