The Jonas Brothers are all grown up!

PHOTOS: Shirtless stars

Nick, 18, and big bro Joe, 21, showed off their bulging biceps while playing football on the beach in Hawaii Wednesday. Flaunting their impressive six-pack abs, the Camp Rock 2 stars -- sans older brother Kevin, 23 -- cooled down with a midday swim.

PHOTOS: Jonas Brothers, then and now

Earlier this month, Joe told Details that he and his family had never been to the Aloha State. "We've seen every state in America besides Alaska and Hawaii, been all over Europe," he said of the group's rigorous touring schedule. "It's been so much fun."

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