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!
When "American Girl" singer Bonnie McKee isn’t writing hit songs—she’s got eight No. 1′s (!)—or dreaming about Eminem, she’s fighting zombies. Or at least that’s what she’s up to in the music video for her uber-catchy new song "Sleepwalker." Watch the vid, and beware of “soul-sucking viruses.”