Other performers include Sigur Ros, the Black Keys, Santigold, Kimbra, Twin Shadow, Jack White, Justice, The Weeknd and Bloc Party.
We rounded up some of the biggest names below, but see the full lineup here.
The festival's early bird, $200 passes sold out in a matter of minutes when ticket sales went live. Full-price tickets to the three-day festival are still available for $230. Lollapalooza takes place August 3-5 in Chicago's Grant Park.
If you still aren't sure about buying tickets, take a listen to our Lollapalooza 2012 Spotify playlist.