Celebrity Rehab

"20/20" co-anchor Elizabeth Vargas has checked into rehab for alcohol abuse ... the second time she's done that in less than a year.

Vargas says, "As so many other recovering alcoholics know, overcoming the disease can be a long and incredibly difficult process. I feel I have let myself, my co-workers and most importantly my family down and for that I am ashamed and sorry."

Vargas spent a few weeks in rehab late last year for alcohol abuse.

Zac Efron -- who was partying in a bar in Ibiza with Michelle Rodriguez -- is not only back on the bottle ... we're told he was never off it.

Zac has had big issues with substance abuse ... going to rehab twice last year for cocaine addiction. We're told he's also a big drinker.

People involved in Zac's life tell us ... his biggest problem is that he always believes he has the ability to stop. As one source says, "He'll stop cold for 3 or 4 days when he has to work and then he's back."

It's no secret Zac loves to party. We're told he's "climbing the walls" just before his various projects end ... waiting for the moment he doesn't have to show up for work in the morning so he can party hard.

Here's the good and the bad.

The good -- Zac's younger brother Dylan is a big influence on him. We're told Dylan has counseled him about the importance of sobriety and Zac doesn't blow him off.

Law enforcement sources connected to the case tell us Apollo only got into the program because he has a prior DUI -- and we're told his real motivation is lowering his sentence.

Inmates who successfully complete the program typically get early releases.

"Dance Moms" instructor Abby Lee Miller so frightened her students ... one pint-sized dancer needed a shrink ... so the mom claims in a new lawsuit.

Kelly Hyland claims Miller made her daughter Paige so nervous during rehearsals ... the girl started suffering panic attacks to the point she couldn't breathe.

Hyland says in the lawsuit producers made it even worse by shoving cameras in Paige's face during her anxiety attacks. She says the whole thing was so traumatic, Paige had to go to a psychiatrist.

Hyland claims Miller tormented her, too ... calling her an alcoholic stage mom ... and insulting her with 8 bottles of tequila as an XMAS present.

We reached out to Miller about the lawsuit ... but all she did was brag about her new book.

"That 70s Show" star Lisa Robin Kelly was killed by lousy treatment and an incompetent staff at the rehab center where she was found dead ... according to a wrongful death lawsuit filed by the late actress' husband.

Robert Gilliam is suing Pax House in Altadena, CA claiming Kelly's "treatment and care were improperly administered" ... and that she was neglected for "an unreasonable amount of time" by workers who weren't fit for the job.

TMZ broke the story ... Kelly died Aug. 15, three days after she was admitted to Pax House. The coroner ruled it an accidental death from multiple drug intoxication -- but never identified which specific drugs were in her system.

Gilliam claims in court docs -- obtained by TMZ -- Kelly was last seen alive by Pax workers sometime during the night of Aug. 14 ... and it wasn't until several hours later that she was discovered dead in her room.

Here's Amanda Bynes (left) looking healthy and fit leaving Cardio Barre in Thousand Oaks on Wednesday ... and Lindsay Lohan (right) exiting Chiltern Firehouse in London.

Kate Major had to be rushed from her Florida rehab facility to a local hospital after suffering a seizure ... TMZ has learned.

According to our sources, the episode went down early Monday morning. We're told Michael Lohan's baby mama had a seizure and complained of chest pains and was taken to JFK Medical Center near West Palm Beach.

Major was ordered back to rehab by a judge earlier this year following a DUI arrest.

She had a similar incident in 2011 when she was also taken to the hospital from rehab after suffering a seizure.

Zac Efron doesn't have any problems with drugs ... at least that's what Zac Efron thinks, according to his friends -- who say anyone telling him otherwise is quickly 86'ed.

TMZ has learned the actor's friends are scared to broach the subject of Zac's sobriety ... because not only will they be ignored -- but they say anyone who makes an attempt is cut from Efron's life.

We're told Zac refuses to believe he's on a destructive path ... and one of his friends tells us they think he could become the next Cory Monteith if he doesn't get help.

As we previously reported ... Zac's friends say he never went to a real rehab facility last year. Instead, they say he received private therapy at a friends house.

Paul Walker's mom will back off her demand to become guardian of Paul's 15-year-old daughter, even though that's what he said he wanted in his will ... but ONLY if Meadow's mom goes to rehab.

Paul's mom Cheryl Walker went to court this week ... ready to do battle with Rebecca Soteros. Rebecca has a serious drinking problem, with 2 DUIs under her belt. Her drinking is why Meadow moved from Hawaii 3 years ago to live with her dad in L.A.

We've learned Rebecca and Cheryl came face-to-face and Rebecca grudgingly told Cheryl she would go to rehab immediately. Cheryl then promised she would drop her bid for guardianship if Rebecca successfully completed the program and agreed to drug testing afterward.

We're told Rebecca said being with Meadow was the most important thing to her, and she knew there would be an ugly court fight if she didn't comply with Cheryl's demands. So Rebecca started a detox program Friday, and will enter full-time rehab in a week.

Lady don't love this country boy -- Trace Adkins' wife has filed for divorce ... after nearly 17 years of marriage.

Rhonda Adkins filed the docs in Tennessee, citing "irreconcilable differences."

According to the docs, the couple was married in 1997 and separated on Monday. They have three daughters (aged 16, 12, and 9). Rhonda wants primary residential custody as well as child support. She also wants alimony.

And this is interesting ... she wants to be named the sole beneficiary of Trace's life insurance policy.

It's unclear if the divorce is related to Trace's alcohol issues -- as we reported, the singer enrolled in rehab earlier this year after getting into a drunken fight with a Trace Adkins impersonator while on board a country music cruise.

David Cassidy's ass just got spanked by the legal system after pleading no contest to DUI -- the judge ordered him to enroll in a 90-day live-in rehab facility for alcohol abuse.

TMZ broke the story ... Cassidy was busted for DUI in L.A. back in January -- his third DUI arrest since 2010.

In addition to rehab, Cassidy was also sentenced to 60 months probation. He must also complete a 9-month alcohol program.

We were previously told Cassidy had enrolled in rehab last month. It's unclear if the judge will give him credit for his previous stint.

Cassidy had originally faced up to a year in jail -- so he should consider this a victory. Even if his wife still wants to divorce him.+

5:07 PM PT -- Cassidy's rep tells TMZ, the singer had already been enrolled in an inpatient rehab facility at the time of his sentencing today and the judge will be giving him credit for the 102 days he's served. We're told Cassidy will be transitioning into a monitored outpatient program (with a sober coach) early next month. The rep says, "David is very committed to his sobriety."

Our photog gave Karrueche Tran plenty of chances to rip her ex Chris Brown to shreds last night ... but she took the high road each time.

We got Karrueche walking into 1 OAK in West Hollywood where our guy peppered her with questions -- asking her about jail, his alleged cheating, his new modeling agency -- all designed to get her to trash CB ... but she did not take the bait. Not once.

Karrueche Tran didn't dump Chris Brown because of the girl he allegedly banged in rehab -- sources close to the model tell TMZ ... she dropped the hammer on their relationship because he refused to stop texting his army of jump offs.

There's been speculation that Karrueche pulled the plug when she found out he had hooked up with another girl in his facility at the beginning of March -- but we're told the break-up preceded that ... We're told Karrueche ended things after she visited Chris in rehab the month before.

Sources tell us ... Karrueche saw Chris' phone during her visit -- and it was filled with inappropriate texts from other girls. It was the last straw. We're told Karrueche was especially pissed because she'd been nothing but supportive to Chris throughout his ordeal, even going to court with him.

Indianapolis Colts owner Jim Irsay checked into a "highly-respected health care facility" ... one day after he was arrested for DUI and drug possession in Indiana.

A rep for the Colts tells TMZ Sports, "Yesterday, Jim Irsay took the first step toward regaining good health. He voluntarily checked into a highly-respected health care facility and is committed to undergoing the treatment and care necessary to help him meet his challenges head-on."

The Colts did not go into detail on the nature of the "challenges" Irsay faces ... but the 54-year-old has previously acknowledged his issues with substance abuse.

The Colts rep adds ... "Jim, the Irsay family, and the Colts organization are all deeply appreciative of the incredible outpouring of support and compassion from our fans and the Indiana community."

As we previously reported, Irsay was pulled over late Sunday night for traffic violations -- and during the stop, officers determined he was intoxicated ... though police have not said if he was drunk or high.

Cops did say Irsay was in possession of various prescription drugs -- but the pills didn't match the prescription bottles.

Chris Brown will stink to holy hell ... because he's only allowed one shower every two days.

According to our sources, Brown -- who will sit in jail until April 23 -- is in solitary confinement 23 hours a day ... which means he won't have a cellmate to disgust with his vile odor.

We're told Brown is allowed to work out in his cell and can read library books.

Brown was hauled back to jail after getting thrown out of a rehab facility in Malibu. The judge wants him behind bars until the D.C. assault case runs its course in mid-April. And, if he's convicted, Chris could be transferred to prison for violation probation in the Rihanna case.