Kaley Christine Cuoco-Sweeting (/ / KAY-lee KWOH-koh; born November 30, 1985) is an American actress. She first came to attention for her role as Bridget Hennessy on the ABC sitcom 8 Simple Rules (2002–2005). Cuoco later starred as Billie Jenkins on the final season of the supernatural drama series Charmed (2005–2006). She has gained recognition for her role as Penny on the CBS comedy series The Big Bang Theory (2007–present). Cuoco has also appeared in the films Lucky 13 (2005), The Penthouse (2010), and Hop (2011).