Jimmy Fallon as Neil Young. Bruce Springsteen as a younger Bruce Springsteen. This rendition of LMFAO’s “Sexy and I Know It” appeared on last nights final night of Fallon’s Springsteen Week as well as the three year birthday of his show being on NBC. There was also a lengthy interview with The Boss on the episode. It’s all very special. And even if you don’t laugh out loud or enjoy the parody world of songs being sung in other genres, you can still appreciate this for how incredibly endearing it is.