Lindsay Lohan -- I'm Staying Clean ... FOR LIFE

Lindsay Lohan plans to stay on the straight and narrow for the REST OF HER LIFE -- telling friends, she's serious this time ... no drugs, no booze, no breaking the law ... ever again ... PERIOD.

Sources close to Lindsay tell TMZ, the actress had an epiphany after her sentencing -- and is completely at peace with the judge's decision ... community service, fines, counseling, shoplifters alternative class ... the whole package.

Technically, Lindsay is REQUIRED to stay sober during her formal probation -- which ends after she completes her 480 hours of community service -- but we're told, it doesn't matter ... Lindsay's committed to sobriety for the long haul.

One thing ... Lindsay does take issue with the three-year probation itself -- telling friends she doesn't think she deserves it -- but que sera sera ... she has learned to accept her fate.

Bottom line -- her friends are adamant ... Lindsay has learned her lesson once and for all.

Credit: TMZ

Scott Disick: I'm No Longer 'Selfish, Self-Centered'

Scott Disick says giving up alcohol hasn't just made him sober – it's also made him nicer.

"You know, I just realized there's bigger things in the world than just being a selfish, self-centered, pr–k," Disick, 27, told PEOPLE recently at the Famous Stars and Strikes Event benefiting A Place Called Home at Pinz Bowling Alley in Studio City, Calif.

Disick has sought professional help for alcohol and other issues, and says maintaining his sobriety is a daily battle. "There's times that it's difficult but, you know, the good outweighs the bad," he says. "It's nice having a healthier lifestyle than I used to have."

Kourtney Kardashian's off-again-on-again boyfriend, who makes an appearance on Kourtney & Kim Take New York and has a 1-year-old son, Mason, with the reality starlet, says his relationship with his family and Kourtney's is improving – but that's just the tip of the iceberg.

"I mean, I get along better, I think in general, with everybody in the world," he says. "Not only my family, but just even the surrounding people." 

Credit: PEOPLE (Sara Hammel)

Lindsay Lohan -- 'Worried' About Charlie Sheen

Lindsay Lohan believes Charlie Sheen is in the midst of a "life or death situation" ... and has told friends she's "thrilled" that he's checked himself into a rehab center.

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.

We're told Lindsay "understands the problem of having the wrong people around and wants Charlie to understand that he needs to surround himself with positive, sober people."

Credit: TMZ

Lindsay Lohan -- I'm Done Clubbing! (Seriously)

Stop us if you heard this one before -- Lindsay Lohan is telling her friends she is never clubbing again. As in forever. Forever ever. For reals. Stop laughing.

Sources close to LiLo tell TMZ she is "completely over the club scene" -- no more "I'll just have water, thanks" -- and realizes that cutting it out completely is the best chance for her to avoid temptation and remain sober.

We're also told the no clubbing pledge extends to her friends as well -- as in she's going to stop hanging out with the people that only used her to party.

Which pretty much only leaves her trainer and the pizza delivery guy.

Credit: TMZ

Lindsay Lohan -- Giving New Roomie A Free Ride

Lindsay Lohan won't be living in her new Venice pad by herself -- TMZ has learned she's going to have a roommate ... and the girl will be staying there rent-free.

We're told LiLo's new roomie is a girl she met during her time at Betty Ford. According to our sources ... the girl has been sober longer than Lindsay has (FYI -- Lindsay celebrated four months of sobriety Friday).

Sources close to Lindsay tell us she feels it's important to Lindsay to surround herself with other sober people. We're told she's helping the cash-strapped girl out ... letting her live rent-free.

Seems Lindsay's first role post-rehab ... is that of a sugar mama.

Credit: TMZ

Lindsay Lohan Hits 100 Days Sober Mark

Lindsay Lohan has hit a huge milestone on her road to recovery -- she's celebrating her 100th day sober, Radar Online has exclusively learned.

The 24-year-old Mean Girls star has gone 100 days since her last positive drug and alcohol test and is successfully staying away from the substances that have landed her in rehab.

Since entering the Betty Ford Center in Rancho Mirage, California, Lindsay has been earning privileges to leave on day trips, work, and even drive again. All of which are part of the recovery Los Angeles Superior Court Judge Elden Fox hoped to achieve when he sentenced the actress to the treatment center until January 3, 2011.

As Radar Online previously reported, Lindsay is taking her sobriety seriously, according to her mom Dina, and is looking forward to working again in the New Year.

Her father Michael wished his daughter well and exclusively told Radar Online: “I hope she has a decade more.”

Credit: Radar Online