TMZ broke the story earlier today ... the Probation Department is siding with Lindsay, concluding she did NOT violate her probation.
The L.A. City Attorney's Office -- which prosecuted Lindsay Lohan in her shoplifting case -- will ask the judge tomorrow to violate Lindsay's probation and send her to jail ... sources tell TMZ.
Our City Attorney sources say the prosecutor will argue to Judge Stephanie Sautner that Lindsay's conduct that caused her to get booted from the Downtown Women's Center -- where she was doing community service -- is squarely a violation of her probation.
The City Attorney will ask the judge to violate her probation and then sentence her to jail, although our sources would not reveal how much jail time the prosecutor is seeking.
Tomorrow's 10 AM PT hearing should be interesting. We'll be livestreaming, of course.