JACK Black and Jeremy Piven patched things up after a miscommunication on Howard Stern's radio show. Last week, Black told Stern that Piven held a six-year grudge against him because he beat the "Entourage" star for the role of the record-store geek in "High Fidelity." But apparently they now love each other. They "smoked a peace pipe at a friend's house in L.A. and discussed their mutal admiration of each other. Mutual admiration is in full effect," said a friend of both. We're sure that pipe wasn't funny-smelling at all.