35 years old (Born on January 05, 1987)
American actress and model; She is famous from 'Laguna Beach' Reality Show.She attended VH1's Big in '05 Awards, as a nominee for the "it girl" of 2005, which eventually went to Lindsay Lohan. Was slated to be co-hosting a show on UPN called Get This Party Started (2006), but the latter was canceled after only two episodes. Has an older brother, Mike. She was on the cover of Seventeen, had sexy photos in Rolling Stone and has appeared on numerous television talk shows. Ranked #8 on Reality TV Magazine's List of The Greatest Female Reality Stars of 2005.
Kristin Cavallari's Best Moments
Fun Facts About Kristin Cavallari
Moved to Laguna Beach the summer after junior high to live with her dad and brother. Before that, she lived in Colorado and then moved to Chicago and lived with her mom, step-father, and step-brother. One of the very few characters not originally from the area.
Aspires to be either a talk show hostess or a news anchorwoman.
Has two siblings, one a biological brother and one a step-brother.
Of Italian descent.
Attended her high school freshman year at a Catholic school before switching to a public school.
She is a freshman at Loyola Marymount University in Los Angeles, California. 
Recently had Lasik eye surgery and documented it for realitylasik.com.
Has a shih tzu named Bru.