The Chicago Tribune has posted the official Lollapalooza lineup a bit early (it was supposed to be released at midnight, so what's a couple of hours early?) The lineup is pretty much the leaked lineup that was posted yesterday on a Brazilian website.
Headliners are Red Hot Chili Peppers, Black Keys, and Black Sabbath. Other notable acts include Afghan Whigs, At The Drive In, Jack White, M83, Bloc Party, Franz Ferdinand, Miike Snow, the Shins and TONS more.
This year Lollapalooza takes place August 3rd through the 5th in Chicago's Grant Park and tickets are already on sale. A three day pass is currently available for $230 and Lollapalooza traditionally boost ticket prices as the show nears, so you may want to buy tickets now if you're interested in attending.
Update: Lollapalooza has posted the lineup on the official site.