Cox's 'unique,' happy family'Cougar Town" star Courteney Cox says she, ex-husband David Arquette and Arquette's expectant girlfriend Christina McLarty get along like an extended family. "Now it's great and we actually all had dinner the other night," Cox, 49, told talk-show host Ellen DeGeneres on the edition that aired yesterday. "The whole family. It's a . . . unique relationship. All of us, like, literally: me and Christina and David and Coco," Cox and Arquette's 9-year-old daughter. Cox also revealed on the show that Arquette, 42, and McLarty are expecting a boy.