Still, Trainor honed her act for the Bridgestone Arena audience, teaming up with country's reigning queen (sorry, Faith), Miranda Lambert -- winner of four awards Wednesday night -- for a twangy take on her breakout hit, "All About That Bass."
The duo brought booty back to the Nashville stage, and, judging by Blake Shelton's reaction from the crowd, Miranda's husband couldn't have been more pleased about it.
Later on during the ceremony, CMA Awards co-host Brad Paisley asked Meghan if she was slowly "comin' over to our side." Her response? "Yeah, sure." The reverse Taylor Swift-ception has begun...
Check out photos from Meghan and Miranda's performance below.
Our MTV Artists To Watch... They grow up so fast!