During today's episode of The Ellen DeGeneres Show, the Cougar Town star dished, "They're going to have a baby boy. I hope I'm allowed to say that."
DeGeneres then asked if Cox and Arquette's 9-year-old daughter, Coco, is excited to be a big sister. "Yeah, she's really excited," Cox said. "At first she was nervous, because, you know, it's a big deal. At first, I was nervous, I was like whoa, heavy. Now it's great and we actually all had dinner the other night, the whole family."
"It's a very unique relationship," the 49-year-old added. "All of us like literally, me and Christina and David and Coco. It's great though."
News that Arquette and McLarty are expecting a child together broke in November. The couple has been together for a little over two years.
This will be the first child for McLarty, who's currently around six months pregnant.