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Good genes, good guns! The Jonas Brothers, across the board, have got great bodies ... it's that simple. We caught up with them and their fans (and Kevin's wife Danielle) after their NYC concert last night but we felt the need to Photoshop the girls out and focus on the guys' guns.

Whose got the best arms in your opinion?

And of course you can see ALL the unedited pix below in our gallery ...