Cory Monteith, the lead male star of Glee, has checked himself into rehab. His rep confirms to People that the actor "voluntarily admitted himself" to deal with "substance addiction." Monteith, 30, has discussed his struggles in past interviews, and revealed that he was in rehab once before, at age 19. His girlfriend and co-star Lea Michele says in a statement that she is "grateful and proud" of Monteith's decision. "I love and support Cory and will stand by him through this," she says, according to E!, which reports the move won't interfere with the filming of the season's final two episodes.