JUST ADDED: 5 Seconds of Summer will be rocking the stage at this year's iHeartRadio Music Festival Village in Las Vegas! The band sat down with Ryan Seacrest to break the news. Click here to buy your tickets now, before they sell out!
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