Kaley Christine Cuoco-Sweeting is an American actress, known for her roles as Bridget Hennessy on the ABC sitcom 8 Simple Rules , Billie Jenkins on the final season of the supernatural drama series Charmed and Penny on the CBS comedy series The Big Bang Theory for which she won a Critics' Choice Television Award in 2013 and a People's Choice Award in 2014. Cuoco has also appeared in films such as To Be Fat like Me , Hop and Authors Anonymous .