Nick Jonas: Muscle Man

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Nick Jonas flaunts his arm muscles in a fitted tanktop at the San Pedro Harbor on Sunday morning (March 28) in Long Beach, Calif.

The 17-year-old Jonas brother was accompanied by his big bro Joe Jonas.

The JoBros put on their best shorts and chartered a boat with friends. Joe’s girlfriend Demi Lovato sat this fishing expedition out!

Later in the day, Joe and Nick hit the orange carpet at the 2010 Kids’ Choice Awards.

25+ pictures inside of muscle man Nick Jonas…