Lollapalooza 2010 includes Lady Gaga, Green Day, Soundgarden

lady-gaga-moving-clothes.jpgBefore the world knew who Lady Gaga was, she performed on one of the side stages at Lollapalooza in 2007. She's returning to the summer music festival this year -- as a headliner.

Gaga joins Green Day and a reunited Soundgarden at the top of the bill for Lollapalooza 2010, which announced its lineup Tuesday morning (April 6). The festival, which happens Aug. 6-8 in Chicago, will also feature the likes of Arcade Fire, MGMT, Social Distortion, Phoenix and Erykah Badu -- who will presumably keep her clothes on -- among the 100-plus acts performing.