JAY-Z and Cam'ron have been embroiled in a longstanding beef that took shape during Cam's time at Roc-A-Fella. The situation prompted several shots thrown in Hov's direction on Cam's part but it seems all is well now. Jay and Jimmy have already patched things up and are in business together but Cam coming on stage and officially squashing their beef spoke volumes for hip-hop. The two performed "Welcome to New York City" off of Cam'ron's Roc-A-Fella debut Come Home with Me which featured Hov before all the tension began. 

Source: twitter.com