'Neil Young' joined Bruce Springsteen to cover LMFAO's "Sexy And I Know It" on 'Late Night with Jimmy Fallon' Friday night. The performance was one of four songs Springsteen played to bring the show's "Springsteen Week" to a close.

Of course, that's Jimmy Fallon as Neil, hilarious as ever, but Springsteen's gravelly "Wiggle. Wiggle. Wiggle." is perfectly delivered. Later, Bruce Springsteen and the E Street Band were joined by Tom Morello and The Roots for a version of "E Street Shuffle."