One Direction, Iggy Azalea and 5 Seconds of Summer were among the big winners of the night.
Here's a look at who took home trophies at the 42nd annual event:
Artist of the Year: One Direction
New Artist of the Year: 5 Seconds of Summer
Single of the Year: Katy Perry feat. Juicy J, "Dark Horse"
Pop/Rock Female Artist: Katy Perry
Pop/Rock Male Artist: Sam Smith
Pop/Rock Band, Duo or Group: One Direction
Pop/Rock Album: One Direction, "Midnight Melodies"
Country Female Artist: Carrie Underwood
Country Male Artist: Luke Bryan
Country Band, Duo or Group: Florida Georgia Line
Country Album: Brantley Gilbert, "Just As I Am"
Rap/Hip-Hop Artist: Iggy Azalea
Rap/Hip-Hop Album: Iggy Azalea, "The New Classic"
Soul/R&B Female Artist: Beyonce
Soul/R&B Male Artist: John Legend
Soul/R&B Album: Beyonce, "Beyonce"
Latin Artist: Enrique Iglesias
Alternative Rock: Imagine Dragons
Adult Contemporary: Katy Perry
Contemporary Inspirational: Casting Crowns
Electronic Dance Music: Calvin Harris
Dick Clark Award of Excellence: Taylor Swift