The upfronts for The Cartoon Network’s “Adult Swim” were held in NYC last night and the crowd got a special treat. Rap Mogul Jay -Z took the stage to do a private concert for the invite only crowd. Stars such as Swizz Beatz,Ne-Yo,Fabolous, Kid Cudi, Farnsworth Bently & more came out to celebrate. Check out a clip of hova rapping over “The Boondocks” Theme song