Eminem, Outkast for Lollapalooza
The Survival rapper and the Mighty O hip-hop duo will take to the stage at the event in Chicago in August.
Eminem was previously rumoured to be appearing but his headlining slot has now been confirmed. He last had top billing at the event in 2011.
Lollapalooza founder Perry Farrell said: "He's on top of his game and he's doing a great show. His live show is incorporating really well-made video and guest appearances."
Farrell said: "Every year you're shooting to have just an incredible bill that people will look at and say, 'I'm there.' The music is going to entertain them and do wonders for their heart and so is the city."
This year's festival takes place from August 1-3 in Chicago's Grant Park and will see more than 100 music acts perform across eight stages.