J. Cole hit the stage this past Thursday at the University of Illinois to perform at Chicago's Spark in the Park 2014 music festival. While he was on stage, Cole surprised fans and brought out Chance The Rapper. Once joined on stage, they went on to perform a new record titled 'Thotty'. This joint was originally premiered on DJ Tony Touch's radio show. The Cole feature wasn't revealed until the show in Chicago. Check out the footage above.