The 26-year-old actress is currently in Cliffside Malibu rehabilitation centre, reported TMZ.
"Lindsay recently sat down at Cliffside, where she's currently enrolled in a substance abuse treatment program and made a list of 100 friends. 80 people were on the cut list. Lilo was inspired by a therapy session about 'toxic friends and influences'," a source said.
Lohan will be discharged from the rehab on July 31.