Lindsay Lohan has arrived in a Beverly Hills courtroom to turn herself in for jail.
The "Mean Girls" star was sentenced to serve 90 days in jail earlier this month after a judge determined she violated her probation.
She is likely to serve far less time due to jail overcrowding.
Lohan arrived about 10 minutes late and was accompanied by attorney Shawn Chapman Holley and her mother.
The 24-year-old has been free on bail since missing a court hearing in May for a 2007 drug and alcohol case.
She has been on probation since August 2007 after pleading guilty to misemeanor drug charges and no contest to three driving charges.
THIS IS A BREAKING NEWS UPDATE. Check back soon for further information. AP's earlier story is below.
BEVERLY HILLS, Calif. (AP) -- Lindsay Lohan is due back in court Tuesday to surrender for a 90-day jail sentence that is likely to be whittled down by overcrowding and other credits.
Her stay will be longer than the 84 minutes she spent at a suburban Los Angeles jail in 2006 and marks the beginning of a new phase of punishment for drug and alcohol cases filed that year.
Los Angeles Superior Court Judge Marsha Revel sentenced the "Mean Girls" star to jail, three months in rehab and increased scrutiny by probation officials on July 6 after determining the actress violated her probation by missing seven alcohol education classes since December.
Lohan, 24, burst into tears after hearing the sentence, which came after she tearfully apologized to the judge for not strictly following the terms of her probation.
Dozens of cameras and reporters converged on the courthouse Tuesday morning to chronicle Lohan's arrival and her return to custody.
On Friday celebrity attorney Robert Shapiro signed on to the case after Lohan moved into a sober living facility that he founded. By Monday night, the Los Angeles Times and celebrity website TMZ.com, citing anonymous sources, reported that Shapiro had resigned from the case.
Shapiro met with Revel in a closed meeting late Monday afternoon. The prosecutor handling the case, Danette Meyers, was not present and court officials said there had been no change in requirements for Lohan's surrender.
In an e-mail to The Associated Press sent Monday evening after the meeting, Shapiro said his only comments would be made in open court.
Lohan, a prolific user of the microblogging site Twitter, posted a message roughly 12 hours before her court appearance referencing her looming incarceration.
"The only 'bookings' that I'm familiar with are Disney Films, never thought that I'd be 'booking' into jail eeeks," Lohan posted.
The jail and rehab stints have left some of the actress' projects in limbo, including her planned portrayal of porn star Linda Lovelace in a biopic.
Once considered an up-and-coming star, Lohan has in recent years been better-known as a tabloid staple and for the criminal case she has struggled to put behind her.
Her probation had to be extended for a year to give Lohan more time to complete her alcohol education courses and Revel ordered weekly attendance in December.
But the actress didn't complete the sessions as ordered and missed a court date in May, setting a stage for her return to jail. She is expected to serve her time -- probably a quarter of her sentence or less -- in isolation at a women's jail in the industrial suburb of Lynwood.
The facility has hosted several female celebrities, including Paris Hilton, Nicole Richie, Michelle Rodriguez, Khloe Kardashian and very briefly, Lohan.
Sheriff's officials have said Lohan would be placed in an isolation cell at the jail, where she will spend most of her time and take her meals.
She will be forced to wear a jail-issued jumpsuit and be given a set of simple toiletries that all inmates receive: toothbrush, toothpaste, soap, comb, deodorant, shampoo and shaving implements. Hilton received one for her own secluded 23-day stay in 2007 for reckless driving charges.
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AP Special Correspondent Linda Deutsch contributed to this report.
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