JimmyFallon surprised JonasBrothers fans at the band's latest show with a very impromptu karaoke performance.
asked Jimmy to show up at their NYC show a week ago -- he was told he could do whatever he wanted, and Jimmy tested the limits, asking if karaoke with his boombox would be alright.
Obviously, that was all good with the Jo Bros ... and we're told there was no rehearsal for the surprise appearance, but it looks like it was a moment fans will remember for a long time.
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