Kirsten M. "Kiwi" Smith is an American screenwriter and novelist whose credits include Legally Blonde and Ella Enchanted. She has written most of her screenplays with her screenwriter partner Karen McCullah.

Legally Blonde is a 2001 American romantic comedy film directed by Robert Luketic and written by Karen McCullah Lutz and Kirsten Smith, based on Amanda Brown's 2001 novel of the same name. It stars Reese Witherspoon, Luke Wilson, Selma Blair, Matthew Davis, Victor Garber, and Jennifer Coolidge. The story follows Elle Woods (Witherspoon), a sorority girl who attempts to win back her ex-boyfriend Warner Huntington III (Davis) by getting a Juris Doctor degree at Harvard Law School, and in the process, overcomes stereotypes against blondes and triumphs as a successful lawyer.