07/08/2014 02:36 am ET Updated Jul 08, 2014

Watch Jimmy Fallon Sing 'Fancy' With Crosby, Stills, Nash & Young

Jimmy Fallon just had his fanciest performance yet.

Fallon has already impersonated Neil Young on a number of songs including "Party in the U.S.A." and 'Whip My Hair," but on Monday's "Tonight Show" he took it to a whole new level. Fallon donned his Young getup once again to perform with music legends Crosby, Stills & Nash, "reuniting" CSNY (Crosby, Stills, Nash & Young).

The folk rock supergroup played an acoustic version of Iggy Azalea's "Fancy" and even broke into a little "Suite: Judy Blue Eyes."

And first things first, it was the realest.

Check it out above.

"The Tonight Show Starring Jimmy Fallon" airs weeknights at 11:35 p.m. ET on NBC.