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!
The guys from Foster the People stopped by Los Angeles iHeartRadio station ALT 98.7's Desert Pool Party and talked to Trey about their brand new single, "Best Friends," and even sing a few lines for us!
Check it out: