Heejun Han confuses Diddy, rips his shirt off on 'American Idol'

Fashion consultant Tommy Hilfiger asks Han who he looks up to for his fashion sense; he says, "Jessica Sanchez." Ha!

He starts the performance, then stops the piano player, tells him "that's much too slow for me, I want to dance," and rips off his outfit to reveal a T-shirt over a red button-down shirt underneath.

And busts out with some attitude on the song; even prancing around on stage, he's still not totally letting go vocally, but is having some fun with it. And I think his performance is pretty true to the lyrics and the song's meaning, actually.

"Because you were running around and everything I think you didn't hit the vocal exactly like I know you can... but it was a lot of fun and I really enjoyed it," says a laughing Jennifer Lopez.