From Meghan Trainor's fiery performance of her new single No, to Taylor Swift's sweet tribute to boyfriend Calvin, see all the biggest highlight's from the iHeartRadio awards.
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2/12
Host Jason Derulo kicked things off with a bang as he dived into the audience to crowd surf. Once making it back on two feet the singer broke out into an energetic dance routine.
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3/12
Justin Bieber was the first to perform, and the 22-year-old showed off his impressive guitar skills, as well as his new dreadlocked hairstyle, as he sang an acoustic version of his tune Company.
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4/12
Taylor Swift gave a touching tribute to her boyfriend Calvin Harris, real name Adam Wiles, as she picked up the Best Tour award. "For the first time I had the most amazing person to come home to, when the crowds were all gone and the spotlight went out so I'd like to thank my boyfriend Adam for that," she said.
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5/12
Denim Team! Iggy Azalea opted for a bralet and baggy jeans as she took to the stage with her dancers, to give a fun and energetic performance of her new track Team.
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6/12
Red hot! Meghan Trainor looked amazing in a tight red and black ensemble as she gave a fiery performance of her new track No.
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7/12
Zayn Malik made his first ever solo awards show performance. The former One Direction star raised the temperature as he belted out his steamy new track Like I Would. Although his girlfriend Gigi Hadid couldn't be with her beau at the awards ceremony, the proud model watched his performance at home and snapchatted her reaction to the song.
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8/12
Aaaaw so cute! Taylor Swift was the first to jump up and congratulate her boyfriend Calvin Harris, as he was announced as the Dance Artist of the Year.
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9/12
Demi Lovato sent shivers down our spines as she belted out a very emotional cover of her song Stone Cold, alongside Brad Paisley who accompanied her on guitar.
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10/12
U2 received this year's Innovator award for their incredible career and activism within music. Picking up the trophy on behalf of the band, rock legends Bono and The Edge dedicated their prize to all artists in the world who are fighting for free speech.
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11/12
Justin Timberlake was thrilled to take to the stage to present the Best Tour gong to his close friend, Taylor Swift. Paying tribute to the 26-year-old, the former 'NSync singer said it was an honor to present the trophy to a "great young woman who has accomplished extraordinary things."
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12/12
Selena Gomez picked up the award for 'triple threat'. The singer, who looked amazing in an cut-out orange Mugler jumpsuit, thanked fans for their unconditional support and for sticking with her through a "confusing, beautiful, transitional period."
Can't get enough of the iHeartRadio Awards? Click through for a gallery of the night's best fashion!