Lindsay Lohan Sentenced to 30 DAYS IN JAIL

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Lindsay Lohan will serve 30 days in jail starting on November 9th -- and the judge is holding her on a tight leash to make sure she completes her probation.

Lindsay admitted she violated her probation by not attending therapy sessions as required by the court and by getting kicked out of the Downtown Women's Center.

The judge now says ALL of Lindsay's community service must now be served at the L.A. County Morgue.  And the judge gave Lindsay a tight structure on how she must complete the rest of her probation, and if she doesn't the judge will put a warrant out for her arrest and sentence her to an additional 270 days in jail.

As for the 30 days Lindsay is getting now -- the judge made it clear.... NO HOUSE ARREST.

The Sheriff's Dept. says Lindsay will serve only 20% of the 30 days -- 6 days in jail.

Judge Stephanie Sautner gave Lindsay a strict schedule on completing the rest of her probation -- by December 14, she must have completed 12 days at the morge and 4 psychotherapy sessions. By January 17, another 12 days at morgue and 4 psychotherapy sessions.  And so on.  Everything must be completed by March 29 -- or she goes directly to jail for 270 days.

Lindsay seemed happy, walking out of court saying, "Thank God," under her breath.