Prior to THE BIG BANG THEORY, Kaley Cuoco was best known to television audiences for her role as Bridget Hennesy in the series 8 Simple Rules. Her other television credits include a recurring role on Charmed, and guest appearances on Complete Savages, Prison Break, My So-Called Life, Northern Exposure and Ladies Man.  Cuoco also starred in the cable movies Fat Like Me, Crimes of Fashion and The Hollow, and was seen in the miniseries, 10.5.  Her other television movie credits are Alley Cats Strike, Toothless, Attack of the 50Ft Woman, Growing Up Brady, and the miniseries, Dean Koontz's Mr. Murder.  Additionally, Kaley lent her voice to the animated series Brandy and Mr. Whiskers and Loonatics Unleashed.

Cucoo began her acting career at a young age, appearing in commercials and modeling.  Her first TV role was in 1992's Quicksand: No Escape opposite Donald Sutherland.  She landed her first feature film role at the age of eight in Virtuosity.  Her other film credits include Picture Perfect, Can't Be Heaven and Lucky 13.  She also appeared on stage in community theater productions of Fiddler on the Roof and Annie.

In 2012, Cucoo starred opposite Rob Lowe in the television movie Untouchable: The Drew Peterson Story.  On the big screen, she was seen in the 2011 family comedy Hop opposite James Marsden and Russell Brand.  Cuoco was also seen in The Last Ride, an acclaimed 2012 independent film which screened at several film festivals throughout the country. 

Cuoco is a gifted tennis player, and also hikes, runs, rides horses, goes to the gym and spends time with her rescue dogs.  She is also involved in several charities including EBMRF, the Humane Society, the Elisabeth Glaser Pediatric AIDS Foundation, Animal Avengers and PETA.