Taylor Swift was crowned Artist of the Year at the iHeart Radio Music Awards.

The 'I Knew You Were Trouble' hitmaker beat off competition from Iggy Azalea, Sam Smith, Luke Bryan and Ariana Grande to take home the night's biggest prize at LA's Shrine Auditorium yesterday (29.03.15).

The 25-year-old singer also picked up the Best Lyrics Award for her hit single 'Blank Space' and the Best Song gong for 'Shake It Off'.

The blonde beauty looked emotional as she received the accolades and thanked her fans for their support.

She said: ''More than anything in the world, I just hope that any of the fans watching know how much I adore you ... we've gotten closer and closer with each year, not further apart. Like, you make me so happy.''

As well as bagging herself the prizes, Taylor took to the stage for a surprise performance and accompanied Madonna on guitar as she sang her new track 'Ghost Town'.

Justin Timberlake was also honoured at the ceremony with the innovator award - which was presented to him by fashion designer Tom Ford - while Sam Smith was crowned Best New Artist.

iHeart Radio Music Awards 2015 winners list:

Artist of the Year: Taylor Swift

Song of the Year: Taylor Swift - Shake it Off

Best New Artist: Sam Smith

Best Lyrics: Taylor Swift - Blank Space

Hip Hop/R&B Song of the Year: Jeremih featuring YG - Don't tell 'em

Country Song of the Year: Jason Aldean - Burnin' It Down

Best Fan Army: 5SOSFAM -- 5 Seconds of Summer

Best Collaboration: Jessie J, Ariana Grande and Nicki Minaj - Bang Bang

Renegade: Brantley Gilbert

Alternative Rock Song of the Year: Hozier - Take Me to Church