CHICAGO
08/06/2010 11:50 pm ET | Updated May 25, 2011

Lollapalooza 2010: Lady Gaga, The Black Keys And A LOT Of Fans (PHOTOS)

Day one of Lollapalooza is over--but it sure packed a punch. Massive crowds and a great lineup left fans giddy, sweaty and ready for more.

Tomorrow we will be checking out the Wild Beasts, Stars, the xx, Metric, AFI, Social Distortion, Green Day and whoever else we stumble across along the way. Don't forget to share your Lolla photos! Send 'em to chicago@huffingtonpost.com and we will add them to our slideshows!

For now, check out some photos from Friday's festival. More to come tomorrow!