Taylor Swift took home eight trophies at the 2015 Billboard Music Awards, including Top Female Artist, held in Las Vegas' MGM Grand Garden Arena last night, May 17 (U.S. time).
Taylor also premiered her star-studded music video for “Bad Blood.”
One Direction, Iggy Azalea, and Sam Smith were among the night’s other winners.
One Direction, who won Top Duo/Group, dedicated the award to their "brother" Zayn Malik.
Louis Tomlinson, Harry Styles, Liam Payne, and Niall Horan turned up to their first awards show as a four-piece, but showed there were no hard feelings towards the 22-year-old singer, who left the band in March, as they gave him a shout out during their acceptance speech.
Liam said: "There's one more person to share this with, and that's our brother Zayn."
During their speech, Niall also paid tribute to their devoted fans, saying: "This is absolutely incredible. It's an incredible honor to be here and to be in that category.
"It's unbelievable to come out as the winner, so we just want to say a big thank you to all of you who voted for it, we want to say a massive thank you to Billboard and again to our super, super fans.
"You've been absolutely amazing to us, we love you so much and we'll see you soon."
At the ceremony, 1D were also named Top Touring Artist and the boys were delighted to walk away with two gongs.
Here's the winners' list:
Top Duo/Group: One Direction
Top Billboard 200 Album: Taylor Swift, 1989
Top Rap Song: Iggy Azalea feat. Charli XCX, “Fancy”
Top Male Artist: Sam Smith
Top Radio Song: John Legend, “All of Me”
Top Female Artist: Taylor Swift
Top Touring Artist: One Direction
Top Hot 100 Song: Meghan Trainor, “All About That Bass”
Billboard Chart Achievement Award (Fan-voted): Taylor Swift
Top Country Artist: Florida Georgia Line
Top Artist: Taylor Swift
Top New Artist: Sam Smith
Top Billboard 200 Artist: Taylor Swift
Top Hot 100 Artist: Taylor Swift
Top Digital Songs Artist: Taylor Swift
Top Social Artist: Justin Bieber
Top Streaming Artist: Iggy Azalea
Top R&B Artist: Pharrell Williams
Top Rap Artist: Iggy Azalea
Top Rock Artist: Hozier
Top Latin Artist: Romeo Santos
Top Dance/Electronic Artist: Calvin Harris
Top Christian Artist: Hillsong United
Top Soundtrack: Frozen
Top R&B Album: Pharrell Williams, G I R L
Top Rap Album: J. Cole, 2014 Forest Hills Drive
Top Country Album: Jason Aldean, Old Boots, New Dirt
Top Rock Album: Coldplay, Ghost Stories
Top Latin Album: Enrique Iglesias, Sex and Love
Top Dance/Electronic Album: Lindsey Stirling, Shatter Me
Top Christian Album: Lecrae, Anomaly
Top Digital Song: Meghan Trainor, “All About That Bass”
Top Streaming Song (Artist): John Legend, “All of Me”
Top Streaming Song (Video): Taylor Swift, “Shake It Off”
Top R&B Song: Pharrell Williams, “Happy”
Top Country Song: Jason Aldean, “Burnin’ It Down”
Top Rock Song: Hozier, “Take Me to Church”
Top Latin Song: Enrique Iglesias
Top Dance/Electronic Song: DJ Snake & Lil Jon, “Turn Down For What”
Top Christian Song: Carrie Underwood, “Something in the Water”
Top Radio Songs Artist: Sam Smith