U2, Madonna and Led Zeppelin are among the artists tapped to participate in a series of international concerts by World Peace One, a not-for-profit world peace group. The shows would begin May 17th, though no acts have been confirmed. Alicia Keys has postponed two U.K. tour dates after being put on doctor-ordered vocal rest due to laryngitis. Jimmy Kimmel debuted “I’m F**king Ben Affleck,” a response to girlfriend Sarah Silverman’s “I’m F**king Matt Damon,” featuring Pete Wentz, Good Charlotte, Perry Farrell, Macy Gray and more singing along. After nearly two months without seeing them, Britney Spears was allowed a temporary reunion with her two sons on Saturday.