“Irreconcilable differences.” The catch-all phrase used in many divorces has been cited by Kevin Costner‘s wife Christine Costner as she has filed to dissolve their 18-year marriage, according to TMZ. Kevin’s reps said in a statement, “It is with great sadness that circumstances beyond his control have transpired which have resulted in Mr. Costner having to participate in a dissolution of marriage action. We ask that his, Christine’s, and their children’s privacy be respected as they navigate this difficult time.” No word on what triggered the split. The couple share three kids – 12, 14, and 15 – and both are petitioning for joint custody.