Isla Lang Fisher (born 3 February 1976) is a Scottish-Australian actress and author. She began acting on Australian television, on the short-lived soap opera Paradise Beach before playing Shannon Reed on the soap opera Home and Away. She has since been known for her comedic roles in Wedding Crashers (2005), Hot Rod (2007), Definitely, Maybe (2008), and Confessions of a Shopaholic (2009).
In 2002 she had a part in the film version of Scooby-Doo as Mary Jane, Shaggy's love interest who is allergic to dogs. She wore a blonde wig for portraying her role because Sarah Michelle Gellar was supposed to be the only redhead in the film. The following year, she portrayed the character Kristy in the Australian comedy The Wannabes. Subsequently, Fisher was taken on by an American agent. A larger role in Wedding Crashers, alongside Vince Vaughn and Owen Wilson, in 2005 won her the Breakthrough Performance Award at the MTV Movie Awards. While promoting Wedding Crashers, she was officially crowned the 1000th guest on Australian talk show Rove on 2 August 2005. She entered the set ahead of Owen Wilson, winning the title by two metres.
In 2006, Fisher starred as Becca, a Manhattan party host, in the relationship drama London co-starring Jessica Biel, Chris Evans, and Jason Statham. She played the role of Katie in the romantic comedy Wedding Daze with Jason Biggs. In 2007, she appeared in The Lookout, a thriller film co-starring Joseph Gordon-Levitt and Matthew Goode, and Hot Rod, opposite Andy Samberg. She was scheduled to appear in The Simpsons Movie, although her appearance was cut from the final version. In 2008, she starred in the critically acclaimed romantic comedy film Definitely, Maybe, with Ryan Reynolds, Elizabeth Banks, Rachel Weisz, and Abigail Breslin, and had a voice role in Horton Hears a Who! Fisher has also co-written a script entitled Groupies with Amy Poehler, as well as another project entitled The Cookie Queen. She starred in the movie adaptation of the book Confessions of a Shopaholic, which opened on 13 February 2009. In the film, Fisher played a college graduate who works as a financial journalist in New York City to support her shopping addiction. Confessions of a Shopaholic suffered critically but eventually opened at #4 grossing $15,054,000 on its opening weekend. Fisher received her third Teen Choice Award nomination.
Fisher has spoken out against the lack of opportunities for comediennes in Hollywood. In 2010, she starred in the black comedy Burke and Hare. Fisher then voiced the role of Beans in Rango, a computer-animated Western film released in March 2011. In the movie, Johnny Depp and her Definitely, Maybe co-star Abigail Breslin also provide voice-over roles.