Christina Aguilera and Rascal Flatts are teaming up for a powerful collaboration at the 50th Annual ACM Awards this Sunday.

They will perform two songs together: Aguilera's "Shotgun" and Flatts' new single, "Riot."

“We’re going to do some of her song, then go into Riot,” Jay DeMarcus tells USA Today. “It’s going to be a nice, seamless transition and a really powerful performance.”

"Shotgun" was written for Aguilera's brief stint as a recurring character on ABC's hit drama Nashville. Aguilera portrays pop star Jade St. John, a talented singer who wants to try to make it as a country music star. Aguilera's three-episode arc kicked off on April 14.

“We are putting a different spin on the song for the awards, but it’s a quiet, beautiful song about true love that lasts a lifetime," the pop icon says.

DeMarcus adds that performing with Aguilera is an honor. “When you make a list of people you want to collaborate with, over the years that list gets shorter," he notes. "Christina was one of those names that’s always been at the top of the list, but we’d never had the chance to work with her.”

Aguilera is equally excited to sing with DeMarcus and his bandmates, Gary LeVox and Joe Don Rooney. "I really love the rich tone of (LeVox’s) voice. He has a sound that fans recognize immediately," she says.

Rascal Flatts are up for ACM Vocal Group of the Year at the ACM Awards. The show will be broadcast live from the AT&T Stadium in Arlington, Texas, on April 19.

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