Lindsay Lohan posed for a new mugshot as she headed to jail amid a media circus.
The star has begun a sentence for a probation offence that underlined her inability to put a 2007 drug case behind her.
Someone showered Lohan with confetti outside the Beverly Hills court as she walked in to surrender with dozens of cameras following her.
Two weeks after sobbing at her sentencing, Lohan (24) was more composed, but fidgeted with her hair in court as she waited to begin serving her time.
The judge ordered the cameras off for the moment a bailiff handcuffed her and whisked her into a lock-up cell. Her estranged father Michael shouted: "We love you Lindsay!"
Los Angeles judge Marsha Revel sentenced the Mean Girls star to 90 days in jail, three months in rehabilitation and increased scrutiny by probation officials after ruling that she violated her probation by missing seven alcohol education classes since December.
But sheriff's officials said Lohan would end up serving only about two weeks behind bars because of jail overcrowding and anticipated credits for good behaviour.
After yesterday's brief court hearing, news helicopters chronicled her ride in an unmarked sheriff's car to a suburban women's jail.
Lohan will serve significantly longer than the 84 minutes she spent at a suburban Los Angeles jail for the same case in 2007. Lohan's surrender was long anticipated but not without last-minute drama. Last week she moved into a sober- living facility founded by famed celebrity lawyer Robert Shapiro, who on Friday said he agreed to represent her.
But on Monday afternoon Mr Shapiro announced he was quitting as her representative and it was Lohan's long-time lawyer, Shawn Holley, who accompanied the star to court and stood beside her.
"She's scared as anyone would be, but she's as resolute and she's doing it," Ms Holley said. Lohan was booked into the jail at 10.11am and was described as "extremely co-operative". Once there, she traded in her dark denim jeans, grey top, black corset belt and black jacket for a jail jumpsuit.
She will now spend much of the next few weeks in an isolation unit that has housed celebrities such as Paris Hilton and actress Michelle Rodriguez.