David Arquette celebrated one year of sobriety with ex-wife Courteney Cox, daughter Coco and other family members and friends at Mr. Chow in Beverly Hills, Calif., last night. 

OK! GALLERY: DAVID ARQUETTE AND GIRLFRIEND CHRISTINA MCLARTY HOP ON THE SUBWAY IN NYC

Joining the group were David's sisters, Patricia Arquette and Alexis Arquette (born Robert), who also came out to celebrate over dinner. 

David checked himself into treatment on January 1, 2011 for "alcohol and other issues." He and Courteney separated in October 2010, but have yet to file for divorce. 

OK! NEWS: DAVID ARQUETTE TO DAVID LETTERMAN: COURTENEY IS FANTASTIC… WE'RE STILL SEPARATED" 

He recently starred on Dancing With the Stars, and Courteney and Coco were there every week to cheer him on. We love these supportive exes! 

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