WATCH: Justin Timberlake Brings "Sexy Back" With Barbershop Quartet

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    Lloyd Bishop/NBC
    Pictured: (l-r) A.D. Miles, Tom Shillue, Justin Timberlake, Jimmy Fallon, Chris Tartaro

    Justin Timberlake is on a roll.

    Just a few days after scoring boffo ratings with his hilarious fifth appearance hosting Saturday Night Live, the singer-actor outdid himself by performing a barbershop quartet version of his 2006 hit "SexyBack" on Late Night With Jimmy Fallon.

    Joining Jimmy Fallon's Barbershop Ragtime Gals, Timberlake eschewed his suit and tie Tuesday night for the group's signature yellow, green and red striped jacket, bow tie and hat as he led them through an a cappella rendition of the song.

    He also sang his new single, "Mirrors," as part of his weeklong stint serving as Late Night's musical guest to plug his new album, The 20/20 Experience, which drops next Tuesday.