LAS VEGAS, NV - MAY 20: Recording artists Christina Aguilera (L) and Demi Lovato perform onstage during the 2018 Billboard Music Awards at MGM Grand Garden Arena on May 20, 2018 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)
LAS VEGAS, NV - MAY 20: Recording artists Christina Aguilera (L) and Demi Lovato perform onstage during the 2018 Billboard Music Awards at MGM Grand Garden Arena on May 20, 2018 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)