Kaley was born in Camarillo, California. She began modeling and acting at age 6. Her first major role was in the 1992 TV movie Quicksand: No Escape. 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.
Kaley was named #77 on FHM-Us' 100 Sexiest Women in 2005 and #21 in 2008. Cuoco played Bridget Hennessy on the ABC sitcom 8 Simple Rules. Bridget was the eldest child, despite Cuoco being six years younger than her on-screen little sister played by Amy Davidson, and was portrayed as "the most beautiful girl in the school." She had several boyfriends throughout the series and used her feminine wiles to exert significant control over the boys she encountered.
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Cuoco will star in Hop and as Wanda in The Last Ride which will be released in the near future. She has also been cast alongside Cam Gigandet, Penn Badgley and Crystal Lowe in Darkness Falls, expected to be released in 2011.