The 'I Knew You Were Trouble' hitmaker earned the night's top prize for Artist of the Year and she also took home three additional awards, including Favourite Pop/Rock Female Artist, Favourite Country Female Artist and Favourite Country Album for 'Red'.
Meanwhile, 'Mirrors' crooner Justin won three gongs following his hugely successful musical comeback earlier this year. His awards haul included Favourite Pop/Rock Male Artist, Favourite Soul/R&B Male Artist and Favourite Soul/R&B Album for 'The 20/20 Experience'.
'Diamonds' singer Rihanna was overcome with emotion as she took to the stage to accept the first ever Icon Award at the tender age of 25, which was presented to her by her mother Monica Braithwaite.
Monica said: ''I'm so proud of you. I know your journey hasn't been an easy one, but tonight I admire and applaud you for being so strong and so positive and so humble and so focused. It's amazing how you manage to take good from all your experiences.''
Other big winners at the AMAs included boy band One Direction, who won two awards - Favourite Pop/Rock Band and Favourite Pop/Rock Album for 'Take Me Home' - Ariana Grande, who earned the New Artist of the Year prize, and Macklemore & Ryan Lewis, who won two awards for Favourite Rap/Hip-Hop Artist and Favourite Rap/Hip-Hop Album for 'The Heist'.
2013 American Music Awards winners:
Artist of the Year: Taylor Swift
Favourite Pop/Rock Male Artist: Justin Timberlake
Favourite Pop/Rock Female Artist: Taylor Swift
Favourite Pop/Rock Band/Duo/Group: One Direction
Favourite Pop/Rock Album: One Direction, 'Take Me Home'
Favourite Country Female Artist: Taylor Swift
Favourite Country Male Artist: Luke Bryan
Favourite Country Band/Duo/Group: Lady Antebellum
Favourite Country Album: Taylor Swift, 'Red'
Favourite Rap/Hip-Hop Artist: Macklemore & Ryan Lewis
Favourite Rap/Hip-Hop Album: Macklemore & Ryan Lewis, 'The Heist'
Favorite Adult Contemporary Music Artist: Maroon 5
Favourite Electronic Dance Music Artist: Avicii
Favourite Soul/R&B Male Artist: Justin Timberlake
Favourite Soul/R&B Female Artist: Rihanna
Favourite Soul/R&B Album: Justin Timberlake, 'The 20/20 Experience'
Favourite Adult Contemporary Artist: Imagine Dragons
Favourite Latin Artist: Marc Anthony
New Artist of the Year: Ariana Grande
Single of the Year: Florida Georgia Line feat. Nelly, 'Cruise'
Icon Award: Rihanna
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