David Arquette Celebrates 100 Days SoberThe party's over for David Arquette -- and he couldn't be happier!

The star, who made a number of embarrassing on-air confessions about his marriage to Courteney Cox following the announcement of their separation in October, entered rehab in early 2011.

A source close to the actor told PEOPLE that Arquette was being treated for "for drinking and depression, not hard drugs." After completing 30 days of treatment, Arquette checked out of the undisclosed facility and is now celebrating 100 days sober.

Today, the actor tweeted, "I have 100 days of Sobriety today!!! Life is beautiful.:D"