Born and raised in Ventura, Calif., Allen gave up pursuing a career in teaching to become an actress. Since her start in the business, she has appeared in Liar Liar, Confessions of a Dangerous Mind, Paycheck, and Anger Management, among others.
Allen has also appeared on television, taking on an 11-episode arc on the short-lived 2006 primetime series What About Brian.
After costarring with George Clooney in the 2002 film Confessions of a Dangerous Mind, the two dated for two years before their relationship ended in March 2004. Allen has also dated David Spade and Ben Affleck.