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!
Tegan and Sara hang out with Kennedy backstage at Lollapalooza, where they chat about why the don't necessarily like making music videos, their latest album, Heartthrob, and being smart enough to have Ayn Rand inside jokes. We love these talented twins!