Lady Gaga, Green Day, Soundgarden Headlining Lollapalooza

Lady Gaga will make her debut Lollapalooza appearance this summer.  The pop singer will be joined by Green Day and a reunited Soundgarden as headliners during the 2010 installment of the long-running outdoor festival, which takes place Aug. 6-8 in Chicago's Grant Park. The pop singer will be joined by Green Day and a reunited Soundgarden as headliners during the 2010 installment of the long-running outdoor festival, which takes place Aug. 6-8 in Chicago's Grant Park.

Other acts confirmed today by organizers for the three-day outdoor festival include Arcade Fire, The Strokes, Phoenix, MGMT, Hot Chip, The Black Keys, Spoon, The New Pornographers, Erykah Badu and Grizzly Bear. A complete list of performers can be found at the Lollapalooza website