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She then reconciles with Janis, Damian, and Aaron, and reaches a truce with the Plastics.
By the start of the new school year, the Plastics have disbanded.
Despite this discovery, Cady decides to forego Janis's scheme for ethical reasons.
Meanwhile, Cady becomes attracted to Regina's ex-boyfriend, Aaron Samuels, whom a jealous Regina proceeds to steal back at a Halloween party by kissing him in front of Cady.
When Regina is finally made aware of Cady's treachery, she retaliates by spreading the contents of her Burn Book all over the school, quickly inciting a massive brawl.
To avoid suspicion, Regina inserts a fake libel of herself in the book in order to blame Cady, Gretchen, and Karen, the only female students not mentioned in the book.
Fey wrote two roles based on fellow SNL alumni, Amy Poehler (whom Fey thought the producers would not accept because of being too young to portray a teenager's mother) and Tim Meadows, and the cast ended up with a fourth veteran of the show, Ana Gasteyer.
Rachel Mc Adams was cast as Regina because Fey felt Mc Adams being "kind and polite" made her perfect for such an evil-spirited character.Seeing that Cady is getting along with the Plastics, Janis hatches a plan of revenge against Regina for some past slight, using Cady as the infiltrator.Cady soon learns about Regina's journal "The Burn Book", which is filled with rumors, secrets, gossip, and insults about the other girls and some teachers at school.Mc Adams was cast during the time as Allison Hamilton in The Notebook.Amanda Seyfried also read for Regina, and the producers instead suggested her for Karen due to Seyfried's "spacey and daffy sense of humor".
Without any friends, shunned by Aaron, grounded by her parents and despised by her peers at school, Cady takes full blame for the Burn Book and becomes an outcast.