LAS VEGAS, NV - MAY 17: Recording artists Calvin Harris (L) and Taylor Swift attend the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015 in Las Vegas, Nevada. (Photo by Larry Busacca/BMA2015/Getty Images for dcp)
LAS VEGAS, NV - MAY 17: Recording artists Calvin Harris (L) and Taylor Swift attend the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015 in Las Vegas, Nevada. (Photo by Larry Busacca/BMA2015/Getty Images for dcp)