|“||There's no time like right now to start.||”|
— Courtney (pretending to be Ali)
Alison's Pretty Little Diary is a September 6th entry of Alison's diary that was written by Courtney (in the series) and written by Sara Shepard in 2010. The content is almost a repeat of the prologue of Killer -- The Liars tried to steal Ali's flag and the switch occurred. Courtney was pretending to be Alison so she has a bad personality when writing in the diary.