Billboard Music Awards 2017 LAS VEGAS, NV - MAY 21: Actor/singer Cher (C) performs onstage during the 2017 Billboard Music Awards at T-Mobile Arena on May 21, 2017 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)Photo by: Ethan Miller Billboard Music Awards 2017 LAS VEGAS, NV - MAY 21: Singer Celine Dion performs onstage during the 2017 Billboard Music Awards at T-Mobile Arena on May 21, 2017 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)Photo by: Ethan Miller Billboard Music Awards 2017 LAS VEGAS, NV - MAY 21: DJ David Guetta (top) and rapper Nicki Minaj perform onstage during the 2017 Billboard Music Awards at T-Mobile Arena on May 21, 2017 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)Photo by: Ethan Miller Billboard Music Awards 2017 LAS VEGAS, NV - MAY 21: (L-R) Musicians Alex Pall of The Chainsmokers, Halsey, and Andrew Taggart of The Chainsmokers accept Top Collaboration for 'Closer' onstage during the 2017 Billboard Music Awards at T-Mobile Arena on May 21, 2017 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)Photo by: Ethan Miller Billboard Music Awards 2017 LAS VEGAS, NV - MAY 21: Singer Lorde performs onstage during the 2017 Billboard Music Awards at T-Mobile Arena on May 21, 2017 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)Photo by: Ethan Miller Billboard Music Awards 2017 LAS VEGAS, NV - MAY 21: Singer Julia Michaels performs onstage during the 2017 Billboard Music Awards at T-Mobile Arena on May 21, 2017 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)Photo by: Ethan Miller Billboard Music Awards 2017 LAS VEGAS, NV - MAY 21: Musicians Brian Kelley (L) and Tyler Hubbard of Florida Georgia Line accept Top Country Song for 'H.O.L.Y.' onstage during the 2017 Billboard Music Awards at T-Mobile Arena on May 21, 2017 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)Photo by: Ethan Miller Billboard Music Awards 2017 LAS VEGAS, NV - MAY 21: (L-R) Musicians Alex Pall of The Chainsmokers, Halsey, and Andrew Taggart of The Chainsmokers accept Top Collaboration for 'Closer' onstage during the 2017 Billboard Music Awards at T-Mobile Arena on May 21, 2017 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)Photo by: Ethan Miller Billboard Music Awards 2017 LAS VEGAS, NV - MAY 21: DJ David Guetta (top) and rapper Nicki Minaj perform onstage during the 2017 Billboard Music Awards at T-Mobile Arena on May 21, 2017 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)Photo by: Ethan Miller Billboard Music Awards 2017 LAS VEGAS, NV - MAY 21: DJ David Guetta (top) and rapper Nicki Minaj perform onstage during the 2017 Billboard Music Awards at T-Mobile Arena on May 21, 2017 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)Photo by: Ethan Miller Billboard Music Awards 2017 LAS VEGAS, NV - MAY 21: DJ David Guetta (top) and rapper Nicki Minaj perform onstage during the 2017 Billboard Music Awards at T-Mobile Arena on May 21, 2017 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)Photo by: Ethan Miller