Celebrity Rehab

Dina landed at LAX this afternoon with her other children: Ali, Michael Jr., and Cody. Lindsay hasn't seen them since she got out of rehab, so she's overdue for a little QT with the fam.

Starr was arrested and booked on suspicion of felony possession of a controlled substance early Thursday ... according to Salt Lake City PD arrest documents.

Starr was a patient on the third season of "Celebrity Rehab" back in 2009. He also appeared on the most recent season as an example of a celeb who got clean after appearing on the show.

Sources close to Lohan tell us ... Lindsay is "worried" about Sheen because his most recent bender shows "obvious signs of addiction" ... something Lindsay knows about all too well.

But after Sheen decided to check himself into a treatment center Friday afternoon, Lohan is confident he can get his life back together ... if he commits himself to sobriety.

Sources close to Demi tell us ... the actress wants to focus on getting back into her "regular routine" and spend time with her family and close friends.

We're told Demi will continue to seek treatment for her issues while in L.A.

As TMZ first reported, Demi went to the treatment center after punching a backup dancer on a tour with the Jonas Brothers -- and claims she sought help for "emotional and physical issues."

UPDATE: Demi was spotted out this afternoon in Santa Monica.

Joey claims he's "looking forward" to baring it all in the March issue of the nudie magazine -- telling us, "I take a lot of pride in how hard I work on my body ... The Situation ain't got nothin' on me."

According to sources, the full-frontal shoot is scheduled for early February -- and even though it's somewhat debatable, Playgirl rep Daniel Nardicio tells TMZ, “Joey exemplifies the sort of hot 'Jersey Shore' type that people are really into right now."

TMZ had a few exclusive moments with Lindsay before she ran into a huge pap crush at Equinox in West Hollywood. We asked her about moving in next to Sam Ronson ... but LiLo was pretty focused on getting her workout on.

Bridges was roaming the halls at the ICDC College campus in Van Nuys, CA last week -- where he talked to students about his past addictions ... and explained how substance abuse counselors helped him kick the junk.

Sources close to Demi tell us the singer will be meeting with her family at some point tomorrow to have dinner "outside the facility". We're told she will return to the treatment center that night to continue with her program.

The former Skid Row singer was pounding wine from the bottle and smoking a funny looking cigarette with his pal Sen Dog from Cypress Hill in Hollywood ... when he went off on Drew for repeatedly trying to recruit him to the show.

Bach has had a beef with "Celebrity Rehab" for a while -- last year he revealed, "They ask me every season. I’m not interested in making bad art. Celebrity Rehab with Dr. Drew is out of control. That show sucks."

But last night -- Bach was in full attack mode ... taking several sarcastic jabs at Drew ... before making the "quack" crack.

TMZ has obtained a letter from the folks at Pornhub.com, offering Demi a chance to be featured on their site. The company is obviously excited (no pun intended) at the idea of a Demi sex tape -- even though her people say the rumors are "disgusting."

Pornhub is offering Demi $100,000 for the tape -- even offering her the caveat that, "You don't have to star with male talent, we are willing to accept a solo or Girl-Girl scene just as long as it's shot in HD."

Demi's rep tells TMZ, "Perpetrating these completely unfounded rumors from supposed sources while Demi is in treatment dealing with serious physical and emotional issues is disgusting."

The rep goes on: "The sourcing on this report is so spotty that it is hard to fully respond."

As for claims that Demi's uncle, Francisco Lovato, kept people out of her tour while she had sex inside, Lovato's rep bristles, "Francisco Lovato is the brother of Demi's estranged father. He never traveled on the tour, and certainly didn't serve as some sort of chaperone."

According to docs filed this week in LA County small claims court, P3R Publicity claims Wahler breached a contract by failing to make payments to the tune of $5,000.

P3R tells us, "Considering Jason Wahler's track record, P3R is disappointed but not entirely shocked by his lack of honor and irresponsible behavior." They added, "Perhaps his next reality show should be VH1's "Charm School.'"

Mueller was spotted yesterday (above) leaving the Farmer's Daughter Hotel -- located near the famous Farmer's Market in Los Angeles -- at around 10:00 AM on Thanksgiving morning. As you can see from the photo, Mueller looks like she had quite the evening.

The photographer tells TMZ Mueller was escorted straight from the hotel to a sober living facility in Beverly Hills.

Mueller has been in and out of rehab in the last few years.

TMZ made multiple attempts to contact Mueller. We never heard back.

Patrick's rep tells TMZ ... the 57-year-old actor checked himself in to the rehab clinic Wednesday afternoon -- in an effort to "get a grip on his addiction and educate himself."

We're told Patrick's family has been pushing for the actor to seek professional help for roughly 30 years ... and are "very happy and supportive" of his decision.

Demi's rep tells TMZ ... "Demi Lovato is not in treatment for drug or alcohol addiction. As we have said since she entered treatment last week, Demi decided to seek help for emotional and physical issues she has battled throughout her life."

The rep adds, "She has taken this step in order to get her life in order. While we know many are interested in Demi and her life, we do ask for a modicum of privacy during this difficult time."

TMZ has learned season 2 of the teen sitcom went on hiatus in July so Demi could go on tour with the Jonas Brothers -- and last month, Disney told the cast and crew that production was set to resume in mid-January.