Jennifer Aniston rang in her 57th birthday with boyfriend Jim Curtis by her side, and she couldn't be happier with their low-key life. "Jen and Jim have been inseparable," a source exclusively tells Us Weekly of the couple, who were first linked in summer 2025. The Morning Show actress, 57, has been "really happy" with Curtis, 50, the insider says, noting, "This is the most comfortable she has felt in a long time, and it's still going well.