Lindsay Lohan's hoping Friday the 13th proves to be lucky when it comes to staying sober.

The 21-year-old actress checked out of rehab on Friday, her publicist, Leslie Sloane, confirmed to E! News. Sloane said the actress "successfully completed" a 45-day regimen at Promises, her home away from home since a booze-soaked Memorial Day weekend that ended up with her Mercedes wrecked and her in the hospital facing charges of driving under the influence after police found what was believed to be cocaine in her car.

"She has transitioned to an intensive outpatient program, which includes attendance at daily AA meetings, outpatient therapy and daily testing," Sloane added in a statement to People. "She's doing great. Lindsay is working hard on her sobriety and we are all supporting her."

The publicist added that "on her own, [Lohan] has also made the decision in support of her sobriety to wear an alcohol-monitoring bracelet. In part she is wearing the bracelet so there are no questions about her sobriety if she chooses to go dancing or dining in a place where alcohol is served."

The statement seemed to be a preemptive strike at naysayers, coming hours after Lohan turned up in Las Vegas, spending Saturday night at the hot spot Pure. She was there to celebrate the birthday party of one of her friends.

Sources tell E! News that Lohan downed Red Bulls and Voss water but not alcohol while dancing, spinning records in the deejay booth and hanging with fellow glitterati, including members of the Pussycat Dolls, Criss Angel and the MTV reality contingent of Lauren Conrad, Brody Jenner, Whitney Port and Frankie Delgado.

Lohan exited shortly before dawn, accompanied by her friends and Angel.

Pure was supposed to be the site of Lohan's blowout 21st birthday bash July 2. But after extending her stay in rehab last month, she canceled the Sin City celebration and opted instead to mark her birthday quietly with her mother and siblings.

Despite logging the 45-day tour of duty in Promises, it's not as if Lohan hadn't seen the sun since entering the seaside facility on May 28.

Over the course of her rehabilitation, Lohan left the grounds to work out, shop, see movies, roller blade and visit the beach, including a July 4 Malibu to-do—not your average daytrips while in detox but a far cry from Lohan's routine during her first stint in rehab.

Her setup at the swank Wonderland Center in Los Angeles' Laurel Canyon back in January had her leaving the facility during the day to run errands, lunch with pals and work on the thriller I Know Who Killed Me (due out July 27), and then returning to the facility at night.

"She is taking it one day at a time, as she is in it for the long time," Sloane said when Lohan checked out on Feb. 16, also noting that the actress would be continuing her treatment as an outpatient.

Apparently something didn't take that time around, because tales of Lohan's hard-partying ways persisted.

In April, the freckled starlet told Allure that she wouldn't necessarily classify herself as an "addict," although she had admittedly been attending Alcoholics Anonymous meetings for about a year before checking into Wonderland on Jan. 17, instead saying that she stayed at the center for a month because she "felt safe."

"I thought, I'm going to stay here tonight. And I stayed there. For a month. It was great," she told the magazine.

Then came her lost weekend over the Memorial Day holiday.

After a night of clubbing, Lohan got behind the wheel and wound up in a single-car accident on Sunset Boulevard in the wee hours of May 26. She was briefly hospitalized with minor injuries, but not before being arrested on suspicion of driving under the influence.

Two days later, after another round of partying, she admitted herself to Promises to, as dad Michael Lohan told E! Online, seek counseling for abusing alcohol and various drugs, including the painkiller OxyContin and cocaine.

The Beverly Hills Police Department said a "usable amount" of "additional contraband," preliminarily identified as cocaine, was found during its investigation, a caveat that could possibly tack a felony charge onto whatever rap Lohan is facing.

Earlier this month, Lohan's lawyer, Blair Berk (who shuttled the actress to rehab in May), blasted a leaked police report that said the substance was cocaine. Both police and the district attorney refused to comment, saying that the final version wasn't ready yet and no charges had yet been filed.

Lohan is scheduled to make an appearance at the Beverly Hills courthouse Aug. 24.

Work-wise, Lohan's release will allow her to finally begin shooting her next film, the indie Poor Things. Filmmakers retooled their shooting schedule to allow the junior castmember time to get her act together.

"We wish her love and the blending of mind, body and spirit," producers and costars Shirley MacLaine, Olympia Dukakis and Rob Hickman said in a statement last month after receiving her plea for a postponement.

Lohan has also said she's planning to start work on a new studio album this summer, a follow-up to 2005's A Little More Personal.
 

Review Lindsay's highs and lows in our photo gallery.