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Justin Timberlake is heading to Nashville this week ... because he's performing at the CMA Awards! The Memphis-Tennessee born singer has revealed as the annual show's mystery guest on "Good Morning America," and will be performing a duet with Country/Bluegrass star and three-time CMA nominee Chris Stapleton

Chris tells Rolling Stone of the upcoming performance:

"[Timberlake] is obviously one of the greatest musical talents in the world, maybe ever, that we have. I called him up with no thought of him agreeing to it, and he was ready to start planning it right then. I said, 'Well, I think maybe we should wait, and if we get nominated they'll let me have [a slot].' He was so gracious and kind to want to do it and was so excited about it, and I'm excited about it. It'll be something I've never done before for sure."

Also collaborating at the CMA Awards are Keith Urban with John Mellencamp and Thomas Rhett joined by Fall Out Boy. The long roster of performers includes Reba, Brooks & Dunn, Luke Bryan, Miranda Lambert, Blake Shelton, Jason Aldean, Sam Hunt, Kelsea Ballerini, Maddie & Tae and Kacey Musgraves.  

Brad Paisley and Carrie Underwood are back as performers and co-hosts at the 49th CMA Awards Wednesday night on ABC. 

Photo: Getty Images