According to TMZ, the 27-year-old star was inspired to write two lists naming all her friends after the therapy session. One list reportedly names the friends she will keep and the other one the ones she will de-friend.
Souces told the celebrity news site that 80 of the 100 people on the lists will be cut.
Lohan reportedly showed the list to her closest friends who agreed with most of the choices that she made. It was not immediately clear if either of the lists featured Charlie Sheen.
The "Parent Trap" star is currently serving the last days of a 90 day sentence of court-ordered rehab at a Malibu rehab facility.