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Ariana Grande made everybody forget their problems during her performance at the iHeartRadio Ultimate Pool Party.

The pop star took the stage in a retro go-go inspired outfit to sing crowd favorites like "The Way" and "Right There."

But Ari kicked it up a notch when Iggy Azalea joined her on stage to perform their chart-topping hit "Problem."

Check out the rest of the photos from Ariana's #Ultimate Performance below!

PHOTOS: Ariana Grande Performs at the iHeartRadio Ultimate Pool Party

Photo: Brian Friedman for iHeartRadio