Born and raised in the San Fernando Valley, Westmore comes from an entertainment family. Her father, Michael Westmore, is a makeup artist who has won nine Emmy's and an Oscar, for the film "Mask" and her mother, Miriam Westmore, was a model for costume designer Edith Head. Her first film appearance was at the age of three, when she played Robert DeNiro's daughter in the film "Raging Bull". She also appeared in "Star Trek 9: Insurrection". Her television credits include "Star Trek Voyager", "Days of Our Lives", "Weird Science" and "Star Trek: Next Generation". Westmore has extensive theater training that includes the Lee Strasburg Institute and Uta Hagen Master Class. She is a trained opera singer and has appeared in "Dido & Aneas", "Sound of Music" and "Little Shop of Horrors".

She was born on April 26, her hobbies include singing, dancing and rollerblading. Westmore is also a trained equestrian.