The Big Bang Theory star Kaley Cuoco has dismissed reports suggesting she is expecting her first child.

Cuoco, who became engaged to her tennis player boyfriend Ryan Sweeting in September (13) after three months of dating, has brushed off recent U.S. reports suggesting she is set to become a first-time mother.

She took to Twitter.com to shoot down the rumours, writing, "I would like to make something very clear to anyone who cares. I am not effing (sic) pregnant. Do with that what you will."