Mean Girls is a 2004 American teen comedy film directed by Mark Waters. The screenplay was written by Tina Fey and is based in part on the non-fiction book Queen Bees and Wannabes by Rosalind Wiseman, which describes how female high school social cliques operate and the effect they can have on girls. The film stars Lindsay Lohan and features a supporting cast of Rachel McAdams, Lacey Chabert, Amanda Seyfried (in her film debut), and Lizzy Caplan. The film is produced by Saturday Night Live (SNL) creator Lorne Michaels. Screenwriter and co-star of the film, Tina Fey, was a longtime castmember and writer for SNL. The film also features appearances from SNL cast members Tim Meadows, Ana Gasteyer and Amy Poehler.

The film received positive reviews from critics and was a box office success, grossing $129,042,871 worldwide. Mean Girls has been praised as one of Lohan's break-out film roles.Mean Moms, a quasi-spin-off, based on Wiseman's second book, Queen Bee Moms & King Pin Dads, is also in development.

Lindsay Lohan ( /ˈloʊ.ən/; born July 2, 1986) is an American actress, recording artist, and model. She began her career as a child fashion model before making her motion picture debut in Walt Disney's 1998 remake of The Parent Trap at the age of 11. Lohan gained further fame with leading roles in the films Freaky Friday (2003), Mean Girls (2004), and Herbie: Fully Loaded (2005). In 2006 she appeared in independent films including Robert Altman's A Prairie Home Companion and Emilio Estevez's Bobby. In 2004, Lohan launched a second career as a recording artist with her debut album Speak, which was followed by A Little More Personal (Raw) in 2005.

In 2007, her career was interrupted when two driving under the influence (DUI) incidents and three visits to rehabilitation facilities led to the loss of several movie deals. Resuming her career, she guest starred in the TV series Ugly Betty in 2008, and starred in the TV comedy film Labor Pains in 2009. In 2010, she appeared in Robert Rodriguez's film Machete. She has attracted a great deal of publicity, particularly surrounding her personal life.

Rachel Anne McAdams (born November 17, 1978) is a Canadian actress. After graduating from a four-year theatre program at York University in 2001, McAdams initially worked in Canadian television and film productions such as My Name is Tanino, Perfect Pie (for which she received a Genie Award nomination) and Slings and Arrows (for which she won a Gemini Award). Her first Hollywood movie was the 2002 comedy The Hot Chick. McAdams found fame in 2004 with starring roles in the teen comedy Mean Girls and the romantic drama The Notebook. In 2005, she appeared in the romantic comedy Wedding Crashers, the psychological thriller Red Eye and the family drama The Family Stone. She was hailed by the media as "the new Hollywood it girl" and received a BAFTA nomination for Best Rising Star.

However, McAdams withdrew from public life in 2006 and 2007. During this time, she turned down leading roles in high-profile films such as The Devil Wears Prada. She made a low-key return to work in 2008, starring in two limited release films: the film noir Married Life and the road trip movie The Lucky Ones. She returned to prominence in 2009 with appearances in the political thriller State of Play, the science-fiction romance Time Traveler's Wife, TheThe Time Traveler's Wife and the action-adventure film Sherlock Holmes. McAdams's first star vehicle was the 2010 comedy Morning Glory. In 2011, she starred in Woody Allen's romantic comedy Midnight in Paris and made a cameo appearance in the action-adventure sequel Sherlock Holmes: A Game of Shadows. McAdams starred in 2012's romantic drama The Vow, and will next appear in Terrence Malick's To the Wonder and Brian De Palma's Passion.