Fans attending Justin Timberlake's Nashville show got a huge surprise on Wednesday night (5/9) when Justin welcomed his friend Chris Stapleton onstage for a couple songs. After the two treated the crowd to a performance of their duet "Say Something," Justin hinted that they weren't finished just yet, telling Chris, "Now you know I can't let you leave without playing this song." The two then launched into a performance of "Tennessee Whiskey," a song which they sang together at the 2015 CMA Awards in the very same building.