1 Year Sober,
Parties with Courteney Cox
Arquette had checked himself into treatment on January 1, 2011 to deal with "alcohol and other issues."
As for the marriage ... the couple separated back in October 2010 ... but never actually filed for divorce.
Recently, Dave started dating a new girl ... and judging by the fact Courteney came to dinner last night ... seems she's cool with it.