WATCH: Fallon And Springsteen Sing LMFAO

We celebrated Jimmy Fallon's third anniversary on "Late Night" Friday by looking back at his best song parodies over the years, and lo and behold, he sang a new one!In honor of the big three, Fallon donned his Neil Young wig and floppy hat for a cover of LMFAO's "Sexy and I Know It." That alone would have been enough to satisfy most fans, but since it was a special occasion, they pulled out the big guns. For the second verse, Bruce ...

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