The little kid from Third Rock From The Sun is all grown up.
I had a total crush on him when he was on that show, I was probably 14 (and so was he). He has aged darn well. He's also got the perfect build for dancing in a suit that is a little bit baggy. Some people need to dance in properly fitting clothes (i.e. Gene Kelly) but some people look better with a little movement in their clothing when they dance (i.e. Fred Astaire).
And that song is adorable. I am highly tempted to go see their movie now. Apparently I am exactly their target market.
Edit: for Alana - he was the kid with the long hair.