Celebrity Rehab

Our tattoo sources tell TMZ, Adler popped in to T-Man Tattoo with his band to refresh his G'N'R tattoo -- and former UFC champ Chuck Liddell even made a cameo appearance.

Lovato opened up to "20/20" about her recent stint in a treatment center -- where she was treated for cutting, bulimia and other emotional issues.

18-year-old Lovato said the cutting was, "A way of expressing my own shame, of myself, on my own body."

She adds, "I was matching the inside to the outside. And there were some times where my emotions were just so built up, I didn't know what to do. The only way that I could get instant gratification was through an immediate release on myself."

During the interview, Lovato also says she takes "100 percent, full responsibility" for attacking her back-up dancer Alex Welch last year ... saying, "I feel horrible, [She] was my friend."

Lovato says she hopes her story can "open up the eyes of so many young girls" who are fighting the same issues.

Seann had voluntarily sought treatment for "health and personal issues" back in March -- and today a source connected with the actor tells us, "He completed the 30 days successfully ... he's doing great."

Davis appeared in an Orange County courtroom this morning -- where he also pled not guilty to two lesser drug charges.

As TMZ first reported, the "Celebrity Rehab" star was popped in Newport Beach, CA and cops believe he was high on a "central nervous system stimulant (prescription meds) and narcotic analgesic (painkillers) at the time of his arrest.

The actor's rep has released a statement saying, "Seann William Scott has voluntarily admitted himself for proactive treatment to address health and personal issues."

The rep continues, "He appreciates the support of his many fans at this time."

It's unclear what "condition" Tareq is referring to -- but Michaele has said in the past that she suffers from multiple sclerosis.

Tareq and his lawyers have issued a statement saying, "[Michaele] was fired due to her health condition which is a violation of the Americans with Disabilities Act."

Team Salahi says they will announce more details about their gripe later today.

Law enforcement sources tell us the call came in to Pasadena PD around 5:30PM ... Bai Ling was on the roof and there was concern for her safety.

Bai Ling is on the new season of "Celebrity Rehab" ... which, coincidentally, is just starting to shoot.

Before officers could respond ... we're told Bai came in from the roof -- and since there were medical professionals there to handle the situation there was no need for the police.

Starr appeared on the third season of "Celebrity Rehab" back in 2009 -- and was arrested last month for felony possession of a controlled substance. Salt Lake City cops say he had 6 Xanax pills and 6 Opana (painkiller) pills when he was busted.

Starr was 44 years old.

Mike's dad tells TMZ, "It's a terrible shock and tragedy."

UPDATE: Police tell us Starr's body was found in a Salt Lake City home today. Cops say they were called to the house at 1:42PM.

Sources on the set tell us Michaele was asked to leave because she has "no addiction," and thus had "no reason to be there."

Over the weekend we got Tareq Salahi out in Los Angeles who told us that Michaele's only addiction was "probably to chocolate."

In the 11-page letter, obtained from sources connected to Charlie, Warner Bros. states, "Your client has been engaged in dangerously self-destructive conduct and appears to be very ill."

The letter then goes on to describe Charlie's hijinks, including trashing the Plaza Hotel in NYC, coke binges, on-set failures because of drug fatigue, and diatribes against "Two and a Half Men" creator Chuck Lorre.

The letter also notes that Charlie derailed production when he went into rehab, and then he fired his sobriety coach. In fact, Warner Bros. claims it was so concerned about Charlie's well-being, "Warner Bros. had an airplane waiting" to take him to a treatment facility ... but Charlie would have none of it.

As for why Charlie got fired, the letter says there is a clause in his contract saying they can fire a performer who commits "a felony offense involving moral turpitude."

The letter says, "There is ample evidence supporting Warner Bros. reasonable good faith opinion that Mr. Sheen has committed felony offenses involving moral turpitude (including but not limited to furnishing of cocaine to others as part of the self-destructive lifestyle he has described publicly) that have 'interfere[d] with his ability to fully and completely render all material services required' under the agreement."

In short, that's why Charlie was fired.

Charlie's lawyer, Marty Singer, has demanded Warner Bros. pay Charlie for the eight canceled episodes -- or else.

One of the guys behind "Thunder from Down Under" -- a famous male strip show in Sin City -- tells TMZ producers saw the ridiculously jacked pictures of Jeremy that TMZ posted on Friday ... and think he'd make a perfect addition to their line-up.

We're told "Thunder" wants to get their hands on Jeremy as soon as "Celebrity Rehab" wraps up -- despite the fact that he ain't actually Australian ... which is kinda their thing.

But there's one problem -- Jeremy plans to quit injecting himself with hormones now that he's in rehab ... so he might not look exactly the same by the time he gets out. Oh well.

Adler appeared on season two of "Rehab" and the first season of the spin-off show "Sober House" back in late 2008, early 2009. Adler then went on to stints in real rehab centers after being ordered to by a judge as part of a DUI bust.

Tareq is living the bachelor's life in West Hollywood while his wife Michaele is off shooting "Rehab" as well. We tried to ask Tareq what Michaele's "addiction" was -- and all he did was explain she has multiple sclerosis.

We're told Jeremy -- who played Hobie on the show -- got into fitness a few years back as a way to help kick his meth addiction, and it worked ... but what used to be a healthy hobby spiraled out of control ... and now he fears for his life.

Sources close to Jeremy tell us, he's not only addicted to the gym -- he can't stop injecting HGH (Human Growth Hormone) and testosterone (an anabolic steroid).

We're told Jeremy even injects himself with vitamin B12 -- a procedure typically done by medical professionals -- and loads up on countless other supplements he fears are destroying his body.

We're told Lohan is saying she's most upset that her dad, Michael Lohan, began taping the show without ever giving her a heads up.

Lohan is also adamant she will NEVER make an appearance on the show.

Lindsay also wants to know how much Michael is getting paid for the gig -- because she wants to make sure her dad kicks over some of the cash to Dina ... since "he should be paying his child support for Ali and Cody."

FYI -- "Celebrity Rehab" had been gunning for Lindsay to star on the show in the past ... but it never came to be.

Sources connected to the production tell us ... Dr. Drew will have one hell of a cast for Season 5 ... including:

Dwight "Doc" Gooden ...................Former NY Mets pitcher
Tareq AND Michaele Salahi ........ Alleged WH crashers and "Real Housewives of D.C."
Bai Ling ............................................ Actress?
Michael Lohan ............................... Lindsay's dad
Jeremy Jackson .......................... aka Hobie from "Baywatch"

Were you expecting Charlie Sheen?