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!
About halfway into his set, Rihanna joined Eminem on stage for "Love The Way You Lie," and to say¬†the crowd lost their minds would be an understatement.
Rihanna stayed to perform their latest hit together, "Monster," and then sang Dido's part with Em on "Stan."¬†
Check out videos from the performance below!