Lindsay Lohan broke down in tears as she was sentenced to 90 days in jail after violating her probation.
The stunned actress sobbed as the Superior Court Judge Marsha Revel handed down the term and blasted her for not taking her probation in two 2007 drink-driving cases seriously.
Lohan, who will start her sentence on July 20, must also serve 90 days as an in-patient on a substance abuse programme once she is released from jail
However, the Los Angeles Sheriff spokesman Steve Whitmore said later an inmate in Lohan's situation generally serves about 25 per cent of their sentence - approximately 23 days.
The actress had tearfully addressed the judge in a last attempt to avoid jail after it was ruled she violated her probation by repeatedly missing court-ordered alcohol education classes.
Lohan protested she did not realise she had not been keeping up with the order and insisted a busy work schedule had stopped her attending regularly.
She maintained: 'I was taking it seriously. I wasn't expecting any special treatment.'
'I'm not taking this as a joke. It's my life and my career, something I have worked for my entire life.'
She was handed a box of tissues to wipe her eyes as the tears flowed.
Lohan told the judge: 'I have tried to do the best I can. It's just been such a long haul. I don't want you to think I don't respect you and your terms.
'I really did think I was doing what I was supposed to do, and I mean it with all my heart.'
But the judge was insistent, saying: 'I couldn't have been more clear [about my orders]. There are no excuses.'
The Beverly Hills court heard Lohan repeatedly missed once-weekly classes at an alcohol-education programme.
Lohan had failed to attend the course at least nine times since October 16, the court heard.
Her lawyer Shawn Chapman Holley claimed Lohan had done well by meeting the overall terms of her probation.
She urged the judge not to punish Lohan too severely because she 'did the best she could under extremely difficult circumstances'.
After being handed her sentence, the devastated star briefly covered her face with her lawyer's notes, which listed excuses for why she missed some of her classes.
Lohan was on probation after two DUI offences in less than two months in 2007.
On May 26, 2007, the actress was in a Mercedes-Benz that crashed into a hedge along Sunset Boulevard. Less than two months later she was arrested in Santa Monica on suspicion of drink-driving.
Lohan later pleaded no contest to two counts each of drunken driving and being under the influence of cocaine, and one count of reckless driving.
She spent just 84 minutes in Los Angeles County women’s detention center in Lynwood, California in November 2007 due to overcrowding and was placed on three years probation.
Lohan's probation was extended for a year in October after she missed some alcohol-education classes while making a movie in Texas.
In May she failed to show up for a court hearing because she was at the Cannes Film Festival. Her legal team claimed she was stranded in France after her passport was stolen. Lohan eventually made it to court four days late, when she was ordered to wear a Scram alcohol-monitoring ankle bracelet as a condition of her release on bail pending Tuesday's probation hearing. She was also ordered to undergo random drug testing, among other conditions.
On June 6 the bracelet indicated Lohan may have violated her bail by consuming alcohol after the MTV Movie Awards.
The judge doubled Lohan's bail and the actress posted a bond with the court, allowing her to remain out of custody.
At yesterday's hearing, Revel did not consider the Scram anklet as part of her determination of whether Lohan violated probation.
The judge conceded Lohan was ordered to wear the device as a condition of her bail when she appeared in court in May, not when she was placed on probation.
Lohan was ordered to continue wearing the Scram until she reports to jail later this month.
She is expected to serve her sentence at the Century Regional Detention Facility in Lynwood, where she spent just 84 minutes three years ago.
She was sentenced to 30 days in jail for the reckless driving case, 30 days consecutive for the first DUI case and another 30 days consecutive for the second drink-driving case.
Lohan must not drink any alcohol as a condition of her continuing probation.
Oh poor Lindsay. Remember the days when she was a delightful set of twins in The Parents' Trap? Or even a good-girl-gone-bad in Mean Girls? That may seem like an entire lifetime ago, but it, well at least the latter, happened just barely 6-7 years ago. How has it all gone so horribly wrong, Lindsay?
Hopefully she'd learn her lesson this time and stop self-destructing.