The ex-prez’s 60th birthday is actually Aug. 17, but Tim will join movie star Billy Crystal and pop singers Sarah McLachlan and Lenny Kravitz for a musical commemoration of the milestone early next month. Tim has said he believes Clinton is the best president the U.S. has ever had, and has expressed an interest in running for office himself—an impulse Clinton encourages. “The Democrats need candidates who people can relate to in a personal way, people who understand their lives and concerns and share their values,” the former president recently said. “I think Tim can do that.”