LAS VEGAS, NV - MAY 17: Singer Taylor Swift (L) and DJ Calvin Harris attend the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015 in Las Vegas, Nevada. (Photo by Jeff Kravitz/BMA2015/FilmMagic)
LAS VEGAS, NV - MAY 17: Singer Taylor Swift (L) and DJ Calvin Harris attend the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015 in Las Vegas, Nevada. (Photo by Jeff Kravitz/BMA2015/FilmMagic)