LAS VEGAS, NV - MAY 17: John Legend (L) and Meghan Trainor perform onstage during the 2015 Billboard Music Awards held at the MGM Grand Garden Arena on May 17, 2015 in Las Vegas, Nevada. (Photo by Michael Tran/WireImage)
LAS VEGAS, NV - MAY 17: John Legend (L) and Meghan Trainor perform onstage during the 2015 Billboard Music Awards held at the MGM Grand Garden Arena on May 17, 2015 in Las Vegas, Nevada. (Photo by Michael Tran/WireImage)