Kaley Cuoco was born in Camarillo, California in 1985. Her parents are Jeanne Rose Cuoco, an English teacher, and Stephen Michael Cuoco, an engineer. Cuoco started out as a model and actress at a very early age. She was only six when she starred in the movie, Quicksand: No Escape. When she was nine, she starred with Denzel Washington in the film, Virtuosity. She played the part of Karin Carter, a kidnapped victim of a virtual reality entity, who is saved by Lt. Parker Barnes (Denzel Washington).
She gained much attention after her role in Growing Up Brady, in which she played the role of Marsha Brady. By 2004 Cuoco had roles in the television sitcom, 8 simple rules, a mini series on NBC, as well as, 10.5, the Crimes of Passion film on ABC Family and in Debating Robert Lee.
She became a household name thanks to the CBS television sitcom, The Big Bang Theory which began airing in 2007. She played the role of Penny who works in a cheesecake factory and is trying to get into show business as an actress.