Rita Ora at the 2015 Billboard Music Awards at MGM Garden Arena in Las Vegas, NV on May 17, 2015

Taylor Swift at the 2015 Billboard Music Awards at MGM Garden Arena in Las Vegas, NV on May 17, 2015

Chrissy Teigen attends The 2015 Billboard Music Awards-Arrivals in Las Vegas, Nevada on Sunday, May 17th, 2015

Lily Aldridge at Billboard Music Awards 2015 at MGM Grand Garden Arena in Las Vegas, Nevada on Sunday May 17, 2015

Hailee Steinfeld at Billboard Music Awards 2015 at MGM Grand Garden Arena in Las Vegas, Nevada on Sunday May 17, 2015

Bonnie McKee at Billboard Music Awards 2015 at MGM Grand Garden Arena in Las Vegas, Nevada on Sunday May 17, 2015

Jennifer Lopez attends The 2015 Billboard Music Awards-Arrivals in Las Vegas, Nevada on Sunday, May 17th, 2015

Kendall Jenner attends The 2015 Billboard Music Awards-Arrivals in Las Vegas, Nevada on Sunday, May 17th, 2015

Britney Spears at the 2015 Billboard Music Awards at MGM Garden Arena in Las Vegas, NV on May 17, 2015

Mariah Carey at the 2015 Billboard Music Awards at MGM Garden Arena in Las Vegas, NV on May 17, 2015