Celebrity Rehab

Travolta adds, "My heartfelt thoughts are with his family and loved ones at this very difficult time.”

Conaway -- a notorious substance abuser -- had reportedly fallen into a coma after suffering an overdose earlier this month ... and doctors were not able to revive him.

Jeff's inner struggles became public when he appeared on "Celebrity Rehab with Dr. Drew" in 2008 and admitted to being addicted to cocaine, alcohol and painkillers.

Gary's 39-year-old son was on the boardwalk in Venice Beach yesterday ... when he explained how he woke up in an L.A. hospital this week after having "a little too much fun" with booze.

Vikki's best friend, Aubry Fisher, tells us the family members who blocked Vikki on Jeff's behalf last week don't have his best interests in mind because they refused to help him conquer his addictions in the past.

Conaway has been in a comatose state for weeks -- after he reportedly overdosed in his L.A. area home earlier this month.

We broke the story ... Oscar voluntarily checked himself into a treatment facility in California for substance abuse issues a few weeks ago.

Oscar has told friends he does not believe he hit bottom, but checked himself into rehab before things got totally out of control.

As one source put it ... Oscar has had fidelity issues and it seems to correlate with substance abuse ... and that's a matter he's dealing with in rehab.

As TMZ first reported, De La Hoya entered a rehab facility in California sometime within the last few weeks. We're told De La Hoya is seeking help for substance abuse issues. A source close to the boxing legend tells us he has "voluntarily commenced proactive treatment to address certain health and personal issues."

De La Hoya issued a statement to TMZ that reads, "After doing an honest evaluation of myself, I recognize that there are certain issues that I need to work on. Like everyone, I have my flaws, and I do not want to be one of those people that is afraid to admit and address those flaws.

"Throughout my career and my life, I have always met all challenges head-on, and this is no different. I am confident that with the support of my family and friends, I will become a stronger, healthier person.

We're told De La Hoya is seeking treatment for a substance abuse problem and checked into a California-area facility within the last few weeks.

De La Hoya has posted a flurry of very introspective tweets in the past few days, including, "Take a deep breathe and let out all that anger that makes you hate. it really is going to be o.k." and "Stop finding excuses not to live. life is controlled by what you make of it and not of what it makes of you."

Law enforcement tells us ... cops stopped Frankie for a routine traffic violation yesterday when they noticed an active warrant out for her arrest stemming from a probation violation.

We're told cops then performed a search -- and found "drug-related material" on her person.

Lons was arrested and transported to a nearby jail -- where she was booked for the probation violation and misdemeanor possession of drug-related material.

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.