Thomas Rhett is the latest country star to sing a duet with former NFL quarterback Peyton Manning. While performing at Manning's annual "Celebration of Caring Gala" in Indianapolis on Saturday (3/10), Rhett brought the night's host back onstage to help him perform "That Ain't My Truck," a song which Thomas' dad, Rhett Akins, released in 1995. Peyton has now performed with Rhett, Luke Bryan, Dierks Bentley, Cole Swindell and Jake Owen at his "Celebration of Caring" events, which raise money for the Peyton Manning Children's Hospital at St. Vincent.