It’s been a sobering year for David Arquette. After splitting from Courtney Cox, his wife of 11 years, he checked into rehab to seek treatment for alcoholism and other issues. He took to Twitter  over the weekend to celebrate his progress and thank people for their support. "Today marks 1 year of sobriety for me. I thank God for the strength and guidance and my family and friends for their love and support & I [thank you]," the 40-year old wrote. Arquette sat down with Oprah Winfrey last February and opened up about his past relationship with substances. "When I had my first drink of beer, I must have been four-years-old," he told her. He also recalled stealing pot and beer from his father when he was eight: "It's one of my earliest memories." Not necessarily a good one. But it seems to have been a genuinely happy New Year for the recovering actor.