Fans at the Pilgrimage Music and Cultural Festival in Franklin, Tennessee, were in for a big surprise during Justin Timberlake's headlining set on Saturday night (9/23). While JT was performing, Chris Stapleton and his wife, Morgane, joined him onstage to sing "Tennessee Whiskey." The powerful performance was a reprisal of their epic collaboration at the 2015 CMA Awards in Nashville, where Stapleton swept all three categories he was nominated in.