The rumors were swirling for a while that Chief Keef would be added to Lollapalooza 2012. Today the rumors stopped being rumors and became official. Keef will open up Perry’s Stage at 12:15 PM on Saturday, which will be quite interesting for the early afternoon crowd. Keef made his festival debut earlier this month when joined AraabMUZIK during Pitchfork Fest. Bang. Bang.