David Arquette -- I Tried Booze When I Was Four

2/23/2011 6:55 PM PST
David Arquette says he first tasted alcohol when he was just 4 years old ... and started hitting the bottle hard by the time he was 12.

Arquette opened up about his alcohol issues while taping an interview with "Oprah" ... which airs Thursday.

David also admitted his wife Courteney Cox staged an intervention ... and that he's been sober since checking into rehab back in December.