Mgm Grand Garden Arena

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In a May 17, 2015, file photo, Taylor Swift poses in the press room with the awards for top Billboard 200 album for “1989,” top female artist, chart achievement, top artist, top Billboard 200 artist, top hot 100 artist, top digital song artist, and top streaming song (video) for “Shake It Off” at the Billboard Music Awards at the MGM Grand Garden Arena, in Las Vegas. (Photo by Eric Jamison/Invision/AP, File)

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Meghan Trainor poses in the press room with the awards for top hot 100 song for “All About That Bass” and top digital song for “All About That Bass” at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (Photo by Eric Jamison/Invision/AP) ** FILE **

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Taylor Swift accepts the award for top artist at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

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FILE - This May 18, 2014 file photo shows rapper 2 Chainz in white at the Billboard Music Awards at the MGM Grand Garden Arena in Las Vegas. (Photo by John Shearer/Invision/AP, File)

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FILE - In this April 6, 2014 file photo, from left, Jay DeMarcus, Gary LeVox and Joe Don Rooney, of the musical group Rascal Flatts, arrive at the 49th annual Academy of Country Music Awards at the MGM Grand Garden Arena, in Las Vegas. Rascal Flatts later apologized for lip-synching during their performance at the Academy of Country Music Awards.( Photo by Al Powers/Powers Imagery/Invision/AP, file)

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Mark Cuban arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 18, 2014, in Las Vegas. (Photo by John Shearer/Invision/AP) ** FILE **

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Jennifer Lopez poses in the press room with the icon award at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 18, 2014, in Las Vegas. (Photo by Eric Jamison/Invision/AP)

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Ben McKee, from left, Daniel Platzman, Dan Reynolds and Wayne Sermon, of the musical group Imagine Dragons, poses in the press room with the award for top rock album for "Night Visions" at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 18, 2014, in Las Vegas. (Photo by Eric Jamison/Invision/AP)