Bruce Springsteen, Jimmy Fallon Cover 'Sexy and I Know It'; LMFAO Reacts (Video)

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The Bruce Springsteen-Jimmy Fallon “Whip My Hair” duet.

Late Night With Jimmy Fallon wrapped up its Bruce Springsteen week with the Boss himself -- and Springsteen even joined Jimmy Fallon (dressed as Neil Young) to cover LMFAO's "Sexy and I Know It."

The most memorable part of the performance? Springsteen and the audience singing "wiggle wiggle wiggle wiggle." (The two had dueted on Willow Smith's "Whip My Hair" on Late Night.)

But what did the song's creators think? "That's the best thing I've ever seen in my life," Redfoo (one-half of LMFAO, along with SkyBlu) tells The Hollywood Reporter. "I got two bunks open for those guys on the Party Rock Tour bus."

Friday's show was also the NBC late-night talker's third anniversary with Springsteen as the lone guest. In addition to singing "Sexy and I Know It," Springsteen joined Fallon for a lengthy interview (reliving his style through the years and trouble with the bandana, among other topics) and the musician performed two songs from his new album, Wrecking Ball, and "The E Street Shuffle."

Earlier in the week, Kenny Chesney and Elvis Costello performed Springsteen tracks, and Springsteen also dropped by on Monday, Feb. 27.

Watch the performance below: