Kaley Christine Cuoco ( KWOH-koh; born November 30, 1985) is an American actress. She starred as Bridget Hennessy on the ABC sitcom 8 Simple Rules (2002–2005), Penny on the CBS sitcom The Big Bang Theory (2007–2019), and as the title character in the HBO Max comic thriller The Flight Attendant (2020–2022). Cuoco has also played Billie Jenkins in the fantasy series Charmed (2005–2006), voiced the title role in the animated series Harley Quinn since 2019, and played the lead role in the comedy thriller series Based on a True Story (2023). Her film work includes Quicksand: No Escape (1992) and Growing Up Brady (2000), as well as Virtuosity (1995), Hop (2011), The Wedding Ringer (2015), The Man from Toronto, Meet Cute (both 2022), and Role Play (2024). She received a star on the Hollywood Walk of Fame in 2014, and in 2017 founded Yes, Norman Productions.