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Lindsay Lohan, who has now been sober for 100 days, has had to up her security to protect herself from an alleged stalker.

TMZ reported that she is being harassed by phone calls and text messaged from an unknown number. The caller has been making disparaging remarks about her treatment and recovery and also claims to know where the starlet is housed. Lohan is being moved to ensure her security.

Lohan has no completed her first 100 in rehab. She longtime estranged father Michael praised her success. He said, “I hope she has a decade more.”

The troubled 24-year-old will stay in treatment until January 3.