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The iHeartRadio music festival has been going on this week in Las Vegas, and it was certainly a star-studded event!

Usher and Rihanna hit the City of Sin stage, putting on phenomenal performances while more of our fave celebs like Miley Cyrus and Rob Kardashian watched from the audience.

PHOTOS: Nas Performs At The iHeartRadio Theater 

Gwen Stefani came out on stage with her group No Doubt and performed some of their old classics and the band a treat for their fans. They brought out singer Pink, and the blonde bomshells performed ‘I’m Just A Girl.’

And that wasn’t the only surprise guest of the night, as Lil’ Wayne brought out Keyshia Cole to perform her new single during his set!

PHOTOS: Nas Mixes The Old With The New While Performing At The iHeartRadio Theater In NYC

Although she had no guest cameos, once Rihanna hit the stage, everyone was on their feet and she killed her set performing her classics like What’s My Name and Live Your Life.

Check out Ri Ri, No Doubt and more hit the festival stage in the videos below and photos in the accompanying gallery!