LAS VEGAS, NV - MAY 20: Christina Aguilera (L) and Demi Lovato perform onstage duirng the 2018 Billboard Music Awards at MGM Grand Garden Arena on May 20, 2018 in Las Vegas, Nevada. (Photo by Kevin Mazur/WireImage)
LAS VEGAS, NV - MAY 20: Christina Aguilera (L) and Demi Lovato perform onstage duirng the 2018 Billboard Music Awards at MGM Grand Garden Arena on May 20, 2018 in Las Vegas, Nevada. (Photo by Kevin Mazur/WireImage)