Courtney Cox dating Josh Hopkins?

Courtney Cox is dating her Cougar Town costar Josh Hopkins and her estranged husband, David Arquette, is devastated, sources say.

According to American tabloid the National Enquirer, Courteney and Josh behaved like one big happy family while vacationing with her daughter Coco.

“David is heartsick,” a source said.

“He and Courteney had been discussing reconciling, but that’s off the table now. It’s obvious that Josh has captured Courteney’s heart.

“Courteney, Coco and Josh have been carrying on like a family, while David is beyond distraught over the romantic development.

Cox and Arquette announced their separation in October after 11 years of marriage, and David entered rehab shortly afterward. They haven’t yet filed for divorce.