Shock rock legend Alice Cooper joined pop singer Ke$ha Tuesday night in Oslo, Norway to perform her dance version of his classic hit, "School's Out."  Cooper was reportedly in town for a show with Iron Maiden Wednesday night, and popped in during Ke$ha's soundcheck.  After visiting for awhile, the two decided to save the song for an encore, bringing Alice out to help close the show with a bang.  Check out video of the performance below.