Courtesy Nick Jonas

"I never do this, but ," the youngest Jonas Brother writes of his "post workout picture"

July 30, 2013 05:30 PM

Looks like another Disney star is all grown up!

Nick Jonas, 20, Instagrammed an abs-baring “post workout picture,” he explained of an image he posted on Tuesday.

Posing with his right arm lifted behind his head, the toned musician stood with a serious look on his face, while wearing his Nike fitness shorts very low on his waist.

“I never do this but … Healthy living and fitness update,” he wrote. “#diabeticinshape #2.0.”

Unexpected celebrity selfies are apparently in the air. Jonas’s revealing photo comes just a week and a half after Geraldo Rivera, 70, Tweeted – and deleted – a shirtless shot of himself fresh out of the shower.

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