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No wonder Lindsay Lohan was so upset earlier this afternoon -- X17online has just learned that Judge Stephanie Sautner sentenced the starlet to 120 days in jail for violating her probation!

Lohan has been taken in for booking, and she has been been remanded into custody. Her attorney Shawn Chapman Holley said she would appeal the sentence, but it looks like Lilo is out of luck for now.

Judge Sautner told Lohan that should have called Kamofie & Company and notified the owners about the $2,500 necklace that she claims she borrowed, rather than waiting until the police were about to search her house. Lohan was also ordered to complete 480 hours of community service -- 360 of those hours must be completed at the Downtown Women's Center, while the remaining 120 hours will be served at the Los Angeles County morgue.