from www.radaronline.com – He’s one Hollywood star committed to the job!

Hard partying Two and a Half Men star Charlie Sheen has a strict rule when he is filming his hit CBS show (and it’s not on production hiatus because of his drug and booze fuelled benders), according to his ex live-in porn star girlfriend, who is telling all to RadarOnline.com.

The rule Sheen lives by: no smoking crack 12 hours before taping!

“Charlie was working at the time when we were hanging out,” said Lindsay Wager, who goes by the porn name of Elizabeth Ann [pictured].

“When he was partying, he would usually, I would say, allow I’d say 12 hours to recover before he went on set.”

As we exclusively revealed, Sheen spent more than $500,000 on hookers and drugs in the six months before he checked into his latest rehab stint, at-home.

The 45-year-old star was ordering up to an ounce of cocaine at a time and would often go on Ecstasy binges while adding methamphetamine to the potentially lethal cocktail, RadarOnline.com was told.

“Charlie had a seemingly endless supply of eight-balls,” one source previously said.

An 8-ball is slang for one eighth of an ounce of cocaine (approximately 3.5 grams) and is widely recognized as enough for one person to overdose on.

The pair would regularly smoke “large amounts” of cocaine, Wager said, after meeting her high-profile Hollywood beau through a mutual friend.

Despite the true scale of the tragic star’s habit, Sheen — while supposed to be in at-home rehab — took major swipes at his show’s producers who didn’t want him back on set until he had cleaned up his act.

When radio interviewer Dan Patrick asked the $2 million an episode star when he was scheduled to return, Sheen quipped: “August of 2014… at this pace.”

That said, Wager recalled how Sheen loved his job.

“He actually had good things to say about the job,” she said, adding: “It was obvious to me that he loves his job.”

She added: “When I first met him, he asked me if I had ever watched Two and a Half Men and I said no because I’d never seen it before.

“He put it on a couple of times and wanted me to watch it and he was really excited about it. It was apparent he loves what he does.”

RadarOnline.com reported exclusively Wednesday that Sheen’s life is getting even crazier. His wife Brooke Mueller has moved back in with him and the star took Brooke, porn star girlfriend Bree Olson and another woman on a tropical vacation! Sheen’s publicist Stan Rosenfeld told us that he knew where Sheen was but wasn’t going to tell (that’s ok, Stan, we know exactly where he is!). Of course, Rosenfeld is the same publicist who said Charlie had an “allergic reaction” when he was taken to a New York hospital late last year after another wild night of cocaine and porn stars!