A clip of The Big Bang Theory's smoldering female star is making the rounds right now, for good reason.. For some reason, Kaley Cuoco whipped out her phone while she was totally topless during a wardrobe change. Kaley Christine Cuoco, born November 30, , ist an American actress. She is one of the main Characters in the CBS comedy series The Big Bang Theory, where she plays Penny, the sexy next door actress of Sheldon and Leonard. Kaley Cuoco is famous for appearing inan incredibly popular sitcom that will remain unnamed ’cause it’sjust not funny. She’s incredibly beautiful and she says that her boob job was the “best thing she ever did”.