The judge ordered Lohan to surrender on 20 July to begin serving the jail term. The Mean Girls star had been on probation since August 2007 after pleading guilty to misdemeanour drug charges and no contest to three driving charges.
Lohan would also be required to enter an in-patient rehabilitation programme after her release from prison, the judge said. Lohan, who starred in Mean Girls, burst into tears after hearing the verdict. "I did do everything I was told to do and did the best I could to balance jobs and showing up," the BBC quoted her as telling the court.