Charlie Sheen -- I Didn't Fall Off the Wagon ... I'm Just a Lightweight

Charlie Sheen is ashamed about his sloshy behavior at a recent Guns N' Roses concert ... but not because he did anything wrong ... it's because he realized he can't handle his booze like he used to. Sources close to Sheen tell TMZ -- the Warlock…

Tricia Vessey Trista Rehn Tyra Banks Uma Thurman