Jennifer Aniston's Christmas With The Cox-Arquette Family

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Jennifer Aniston met up with friends David and Courteney Cox Arquette and their 4-year-old daughter Coco Wednesday for their annual Christmas Eve dinner at Mastro's Steakhouse in Beverly Hills.

"Jen and Courteney chatted non-stop," a source tells PEOPLE. "Jen was also very sweet to Coco and the two giggled together."

While Aniston's beau John Mayer remained on the East coast, Aniston - dressed in black and smiling from ear to ear - joined the Arquettes and a few other friends in the restaurant's private dining room, which overlooks the kitchen, and features a rhinestone chandelier.

Read the whole story at People