Charlie Sheen spent more than $500,000 on escorts and drugs in the six months before he checked into rehab, RadarOnline.com is exclusively reporting.

The troubled Two And A Half Men star was said to have consumed mountains of cocaine and other drugs as he partied uncontrollably, according to sources within Sheen's inner circle.

"He spent a fortune... his preference is to smoke the cocaine," a close friend told RadarOnline.com.

A fourth adult film actress who partied with Charlie Sheen before he was taken by ambulance to the hospital has been identified as Shyla Jennings, RadarOnline.com has exclusively learned.

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Jennings, a brunette from Texas, was named in court as the victim of a kidnapping plot orchestrated by reality TV vixen Tila Tequila.

Tila has denied any wrongdoing.

Charlie Sheen has spoken out for the first time since his wild party with porn stars that landed him in the hospital.

"I'm fine," Sheen told RadarOnline's Senior Executive Editor Dylan Howard via text message on Friday afternoon around the same time it was announced he was checking into rehab.

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"People don't seem to get it.... Guy can't have a great time and do his job also?"

The Two and a Half Men star finished the text with a characterization of his detractors: “Bunch of turds.”

It's not clear who Sheen was referring to, although RadarOnline.com revealed his father Martin was the one who convinced his son to seek help, along with his employer CBS which said in a statement it was "profoundly concerned for his health and well-being."

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The network announced its hit sitcom is going on production hiatus while the $2 million an episode star seeks help.

Sheen's exchange with RadarOnline.com also draws into question an earlier statement, from his rep, that suggested he "voluntarily entered" an undisclosed rehabilitation center.

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RadarOnline.com was first to report the 45-year-old's decision to seek help.

The oft-troubled actor was taken by ambulance to Cedars-Sinai Medical Center early Thursday after days of smoking and snorting cocaine, according to knowledgeable sources.

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One friend of Sheen's insisted he was hospitalized for a hernia, aggravated when he laughed too hard while watching television.

But as RadarOnline.com reported exclusively, Sheen was anemic with an elevated white blood cell count and dehydrated.

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He was covertly released from the hospital on Thursday night after being treated for what doctors suspect was an ulceration.

Sheen's text message to Howard arrived at 4.23 pm PT.

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The star's comments at the height of yet another scandal are consistent with his attitude of denial that first emerged after he trashed his posh room at New York's The Plaza Hotel, in a frantic bid to find his wallet and cell phone after partying with a hooker.

Then he told RadarOnline.com in another message: "Oh my man, I'm fine...The story is totally overblown and overplayed as far as the reality of the scenario."

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Martin Sheen convinced his son Charlie to check into rehab, RadarOnline.com has learned exclusively.

"Martin did it," a source close to the family told RadarOnline.com. "He was at the hospital on Thursday and when he gets involved it's serious.

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"He wanted Charlie to go to rehab and told him so. And he didn't stop there. Martin insisted."

RadarOnline.com was first to report that Martin was adamant Charlie go to rehab

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"Martin is extremely upset as you can imagine," the source told us. "He's worried Charlie is going to kill himself.

"Martin has jumped in before when things got really bad with Charlie and even told a judge that Charlie needed rehab. He's not afraid to speak his mind."

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The 45-year-old actor was taken by ambulance to Cedars-Sinai Medical Center early Thursday after days of mega partying and virtually no sleep. One friend of Charlie's said he was hospitalized for a hernia, aggravated when he laughed too hard while watching TV.

That statement fits the cover-up pattern that people close to Charlie have perfected. (His New York hospitalization, after yet another snowy night of big fun, was from an "allergic reaction" his camp claimed.)

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"When Martin gets involved you know something is going to happen," the source said. "He's seen Charlie. He's been worried but he wasn't going to stand by any longer."

Martin, 70, spent Thursday at the hospital with Charlie in an effort to convince his son he needed professional help.

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In lieu of Charlie's check-in to rehab on Friday, his hit CBS show Two and a Half Men announced they will be taking a production hiatus and are "profoundly concerned for his health and well-being."

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CBS has announced Two and a Half Men is going on production hiatus after its $2 million an episode star -- Charlie Sheen -- checked into rehab.

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RadarOnline.com was first to report the 45-year-old's decision to seek help.

"Due to Charlie Sheen's decision to enter a rehabilitation center, CBS, Warner Bros. Television and executive producer Chuck Lorre are placing Two and a Half Men on production hiatus," a statement from CBS reads.

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"We are profoundly concerned for his health and well-being and support his decision."

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A third woman who partied with Charlie Sheen before he was taken by ambulance to the hospital has been identified as GiGi Rivera, RadarOnline.com has learned.

Rivera is a 19-year-old brunette porn star who got into the business when she was just 18 and brags on her XXX website that she's already starred in 50-60 adult films.

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"When she isn't having sex in her personal life or on screen, you can find Gigi smoking bowl after some high grade marijuana (her other passion)," the website boasts.

As RadarOnline.com previously reported, two woman have already been identified as having partied with Sheen at his mansion - Kacey Jordan, 22, and Melanie Rios, 19.

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Unlike Jordan, who partied with the Two and a Half Men star until Wednesday afternoon, Rios told friends she was with him when the 911 call was placed on Thursday morning at 6:35 a.m.

Sheen was released from Cedars-Sinai Medical Center on Thursday night after having been on an alcohol and cocaine bender.

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The 45-year-old actor had barely slept since Monday and was smoking and snorting cocaine.

As RadarOnline.com reported exclusively he was anemic with an elevated white blood cell count and dehydrated when taken to the hospital. Doctors suspect he has an ulceration.

Sheen's father, Martin Sheen, was at the hospital with his son and as RadarOnline.com reported, was urging him to check into rehab.

"Martin is extremely upset as you can imagine," a source close to the family told RadarOnline.com. "He's worried Charlie is going to kill himself.

"Martin has jumped in before when things got really bad with Charlie and even told a judge that Charlie needed rehab. He's not afraid to speak his mind."

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UPDATE: Charlie Sheen’s rep tells RadarOnline.com the actor left the hospital Thursday night and will be on the set of Two and a Half Men on Tuesday.

Martin Sheen wants his son Charlie to go back to rehab, RadarOnline.com is reporting exclusively.

Martin showed up at Cedars-Sinai Medical Center on Thursday after Charlie was rushed there by ambulance.

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And while the Two and a Half Men star did not suffer an overdose, as RadarOnline.com was first to report, Charlie had been partying for days, snorting and smoking cocaine.

Porn star Melanie Rios was partying with Charlie Sheen before he was hospitalized, RadarOnline.com has learned exclusively.  We also reported that Kacey Jordan partied with the star before he fell ill.

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Rios, 19, is telling friends she was with the Two and a Half men star at the time a 911 call was placed Thursday morning, at 6:35.

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RadarOnline.com has learned the brunette is close to securing a manager to represent her given the firestorm of media interest, after the actor was rushed to Cedars-Sinai Medical Center in Los Angeles suffering from "severe abdominal pains."