Kaley Christine Cuoco is an American actress who has played notable roles in sitcoms and a comedic thriller. She is best known for her portrayal of Penny Hofstadter in the CBS sitcom The Big Bang Theory (2007–2019). Cuoco also starred as Bridget Hennessy on the ABC sitcom 8 Simple Rules and as the title character in the HBO Max series The Flight Attendant. Cuoco began working as a model and commercial actress at age 6.