Kaley Cuoco, who plays Penny in Big Bang Theory, has dismissed reports suggesting that she is pregnant.

The 27-year-old actress, who became engaged to her tennis player boyfriend Ryan Sweeting in September after three months of dating, has insisted that she's not expecting her first child.

Taking to her Twitter page, Kaley said: "I would like to make something very clear to anyone who cares. I am not effing (sic) pregnant. Do with that what you will."

Kaley previously dated her The Big Bang co-star Johnny Galecki and Man of Steel actor Henry Cavill.