Will Smith got jiggy with it on 'Letterman'

It turns out Jimmy Fallon does not have a monopoly on having celebrities rap on his show. Will Smith stopped by David Letterman's Late Show Wednesday night and he, well, got jiggy with it. That's right, when the band played the song as his walk-on music during the show, Smith walked over, grabbed a mic and partied like it was 1997 (he remembered every word!). If only Letterman's studio audience had picked up on the "nah nah nah nah nah nah" a little faster, it would have been perfect.

And just because it's stuck in our heads now, please enjoy the original:

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