The 2015 Billboard Music Awards ceremony was held on May 17, 2015, at the MGM Grand Garden Arena in Las Vegas.
The show was hosted by Ludacris and Chrissy Teigen.
Other winners included Sam Smith, Iggy Azalea and Pharrell Williams scoring three trophies each.
Meghan Trainor, One Direction, Jason Aldean, John Legend, Enrique Iglesias and Hozier won two categories.
[1][2] Swift premiered her "Bad Blood" music video at the start of the show.