"Who dat, who dat? C-S-N-Y."

Jimmy Fallon reprised his role as Neil Young with Crosby, Stills & Nash last night for a folk-rock cover of Iggy Azalea and Charli XCX's massive hit "Fancy."

Fallon sported his signature Young outfit, which included the hat, long hair, button down shirt, and brown suede jack. With the brim of his hat pulled down to mask his face, he could've been mistaken for the real thing.

David Crosby, Steven Stills, and Graham Nash came on The Tonight Show in support of their new box set, CSNY 1974, a compilation of recordings from their 1974 reunion tour with Young. They took the stage sans "Young" later in the show to perform two of their classics, "Teach Your Children" and "So Begins the Task."

Fallon has performed as Young with the trio once before for a cover of Miley Cyrus' "Party in the U.S.A." He has also performed as Young with Bruce Springsteen for covers of Willow Smith's "Whip My Hair" and LMFAO's "Sexy and I Know It."

"Fancy" has been No. 1 on the pop charts for six weeks now - the longest time for any hit by a female rapper.

Check out the replay of "Fancy" below, and let us know what you think in the comments section!

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