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 Springsteen (dressed as... young Bruce Springsteen) came out and flashed a little bicep.
Was this the best "Late Night" song yet? Let us know in the comments!