Ron Jeremy Sheen 'Totally Sober' at Playboy Party

8/10/2010 4:02 AM PDT

Charlie Sheen 'Totally Sober' at Playboy Party, Says Ron Jeremy

Despite staring down temptation that could break the strongest of men ... Charlie Sheen did not fall off the wagon at a Playboy mansion party this weekend -- so says, Sheen's XXX wingman Ron Jeremy.

TMZ spoke to the Hedgehog who tells us Charlie -- who recently spent some time in rehab in the wake of his Christmas Day arrest -- was "totally sober" during their time in the house that Hef built.

Ron also tells TMZ, Charlie was smiling and laughing and was overall in a really good mood that night.  Shouldn't come as too much of a surprise ... considering Charlie just recently scored the sweetest sentence ever for the Aspen incident involving his wife Brooke Mueller.

Then again, is it even possible to be in a bad mood when you're at the Playboy mansion?