After E! Online broke the story on Tuesday that Zac Efron was in a rehabilitation facility for drug use, more details surrounding the former Disney's former habit has surfaced.

TMZ reported on Thursday the High School Musical star has been in rehab not once, but twice this year for a "serious cocaine addiction."

A source told the gossip site the handsome actor began a cocaine habit two years ago and has also used Molly.

TMZ broke the story on Wednesday that he went to rehab in April after he missed days of shooting Seth Rogen's film Neighbors.

It came to light on Thursday that the actor has had a secret girlfriend for quite some time. Hollywood Life reported that Efron's unidentified mystery mate has been his support system during his struggle with drug use and no one knows about her because he works hard to keep his personal life.

"He's had a serious girlfriend for a while now and he's managed to keep that totally secret so I'm not surprised he was able to keep his trip to rehab secret for so long," a source allegedly close to the star told Hollywood Life exclusively. "Zac is really good at keeping it together, he's a huge control freak and has always been obsessed with keeping his partying on the down low, this getting out is his worst nightmare," the source explained. "He cares so much about keeping his private life private."

The biggest shocker about  Efron in the multiple reports was the big reveal that he shared his hard partying ways with renowned drug user actor Charlie Sheen. 

Radar Online later reported on Thursday that Efron used drugs with Sheen after they met through a mutual friend a year ago. The pair became so tight, that Efron would visit the former Two and Half Men star on the set of his hit cable show Anger Management. The insider revealed that during those visits, the two actors would be holed up in Sheen's trailer for extended periods of time.

"Zac visited Charlie on the set of Anger Management at least a dozen times," the insider said. "The two would hole up in Charlie's trailer when he wasn't filming."

"Zac was in Charlie's inner circle for a few months earlier this year. The two became very good friends. Zac was spending a lot of time at Charlie's Beverly Hills mansion and they were definitely partying together, sometimes for days at a time," the insider revealed. "There were a lot of very good looking women hanging around."

"Some of Charlie's friends were very surprised to see Zac hanging around Charlie because he looked like such a clean cut guy," the source shared The shock of the eyewitness, Efron could surprisingly party as hard as Sheen. "However, he could party with the big boys."

The insider said although the pair became tight, Efron disappeared from Sheen's social circle-likely because he entered rehab.

"Just as quickly as the two became such good friends, Zac abruptly disappeared from Charlie's parties in May," the source added.

"There was no explanation for the absence."

 The Hollywood Life source said Efron turned to drugs because he has been disappointed with his career.

"The drug problem he has been dealing with is because his career hasn't gone the way he had strived for and intended," the source said. "He really wants to be the next Leonardo DiCaprio and he isn't getting those roles."

Tags: Zac Efron