We all know how this movie ends, don't we? P. Diddy's longtime girlfriend and mother of three of his kids -- model Kim Porter -- has had enough, reports Page Six, and she's moving to Beverly Hills with the kids. There were reports of a rift earlier this year when Diddy was spotted hanging with Sienna Miller until all hours in NYC and in London, but Porter stood by him. With new evidence of another Diddy-Sienna hookup last week, Porter's apparently had enough. A source says that P and Porter "can't be together right now," suggesting some wiggle room for yet another reconciliation.