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LAS VEGAS, NV - MAY 22: Singers Tove Lo (L) and Demi Lovato attend the 2016 Billboard Music Awards at T-Mobile Arena on May 22, 2016 in Las Vegas, Nevada. (Photo by John Shearer/BBMA2016/Getty Images for dcp)

LAS VEGAS, NV - MAY 22:  Singers Tove Lo (L) and Demi Lovato attend the 2016 Billboard Music Awards at T-Mobile Arena on May 22, 2016 in Las Vegas, Nevada.  (Photo by John Shearer/BBMA2016/Getty Images for dcp)