United Kingdom, June 10 -- Kaley Cuoco has announced she is expecting her second child with fiance Tom Pelphrey.

Revealing they are preparing to welcome another daughter to their growing family, The Big Bang Theory star, 40, and Tom, 43, shared the news with followers on Instagram on Wednesday (10.06.26) through a series of family photographs featuring their daughter Matilda, three, a sonogram image and a gender-reveal cake.

Announcing the news on Instagram alongside photographs showing the family gathered around a cake with a pink centre, Tom said: "Deep gratitude and joy- so much respect and admiration for @kaleycuoco on this journey of ups and downs."

He added: "(Doc gave her a little prod for the pic and this was her immediate resp...