Star Magazine reports things came to a head when Jen asked Courteney and her 3-year-old daughter, Coco, to come see her on the set. But Courteney’s husband, David Arquette, didn’t really want them to go, says another source, and that set Jen off.

“She called Courteney from Portland,� says a source. “She’d had a bad day on the set and wanted to talk about it. She was hoping Courteney might come to Oregon to see her. But when Courteney told her it wasn’t a good time, Jen lost it. She broke down and screamed that Courteney wasn’t supportive and never makes time for her anymore.

“Courteney was blown away. She feels like all she ever does is listen to Jennifer whine…

“Courteney told Jen that she was being selfish. But Jen didn’t want to hear it and slammed down the phone. They haven’t talked since.