Music's Hottest Stars Rock the iHeartRadio Festival

The iHeartRadio Music Festival took over Las Vegas this weekend, with chart toppers Taylor Swift, Ariana Grande, and Nicki Minaj bringing massive spectacle to the stage at the MGM Grand Garden Arena. After stunning on the red carpet on Friday, Taylor performed a medley of hits, including her latest smash "Shake It Off," as fans sang along. Ariana and Nicki not only performed together, but also brought big energy to their own sets. Meanwhile, the backstage became a celebrity hot spot, as Jennifer Lawrence added some major star power before new boyfriend Chris Martin performed with Coldplay. On the hot men front, One Direction popped up on the red carpet, and Chris Pratt showed serious PDA with Anna Faris on Saturday. Scroll through to see all the stars at this year's festival!

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The One Direction guys took over the red carpet.

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Iggy Azalea put on a colorful show.

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Usher was filled with excitement for a pregnant Alicia Keys.

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Fergie busted a move on stage.

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Jennifer Lawrence made an unexpected appearance to support Chris Martin.

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Hilary Duff embraced her sexy side on the red carpet.

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Lorde commanded the stage.

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Chris Pratt and Anna Faris got silly and sexy on the red carpet.

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Taylor Swift struck a signature pose.

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What diva rumors? Ariana Grande flashed her smile.

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Nicki Minaj showed us skin is still very much in.

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Usher's good looks were on display.

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Alicia Keys showed off her baby bump.

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Jason Derulo opened his arms.

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Nick Jonas took a solo trip up the red carpet.

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Orange Is the New Black costars Pablo Schreiber and Dascha Polanco got chummy backstage.

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Kacey Musgraves looked like she came straight out of a country music video.

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Ryan Seacrest was the host with the most.

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Taylor Momsen let loose during her set with The Pretty Reckless.

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Ariana and Nicki performed their hit "Bang Bang" without Jessie J.

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Chris hung out with Coldplay bandmate Will Champion.

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Chris Martin and Dascha Polanco linked up.