Kaley Christine Cuoco ( /ˈkeɪliː ˈkwoʊkoʊ/ kay-lee kwoh-koh; born November 30, 1985) is an American film and television actress and singer. She first came to attention for her role as Bridget Hennessy on the Emmy Award-winning sitcom 8 Simple Rules. She later starred as Billie Jenkins on the final seasons of the supernatural drama series Charmed. She gained international acclaim and recognition for her current role as Penny on the Emmy and Golden Globe award-winning comedy series The Big Bang Theory, which became the highest rated comedy on television, now second to ABC's Modern Family.
Cuoco began modeling and acting at age 6. Her first major role was in the 1992 TV movie Quicksand: No Escape. She is the third and youngest child of Jeanne Rose Cuoco, a first grade English teacher, and Stephen Michael Cuoco, a former engineer. Her role as Maureen McCormick in the 2000 TV movie Growing Up Brady brought her much attention, as well as a role on the CBS sitcom Ladies Man. In 2004, in addition to her role on 8 Simple Rules where she played a teenager, she had starring roles on the NBC miniseries 10.5, on the ABC Family original movie Crimes of Fashion, and in the independent film Debating Robert Lee. In 2000 she starred in the Disney Channel Original Movie Alley Cats Strike.
Cuoco was named #77 on FHM-Us' 100 Sexiest Women in 2005 and #21 in 2008. She began voicing the character of Brandy Harrington on the Disney Channel's cartoon, Brandy and Mr. Whiskers, later in 2004.