Sarah Jessica Parker is expecting twin daughters through a surrogate pregnancy.

The 'Sex and the City' star, who already has a six-year-old son James Wilkie with husband Matthew Broderick, is thrilled at the prospect of welcoming the two girls later this year.

The couple's spokesperson said: "They are happily anticipating the birth of their twin daughters later this summer with the generous help of a surrogate. The entire family is overjoyed."

Friends say the couple - whose marriage was rocked last year by claims Matthew had cheated on Sarah - have been desperate to add to their family since the birth of James and after several failed attempts they turned to a surrogate.

One said: "After a lot of unsuccessful tries, they came to the conclusion a surrogate was the best alternative.

"They're over the moon and excited as any prospective parents would be. Their life is about to get a lot busier."

Sarah - who accompanied her husband to the premiere of his new film 'Wonderful World' in New York - has previously spoken of her desire to have a daughter as she has been saving her designer clothes and accessories for her.

Speaking soon after James' birth, she said: "I want 'The Girl' as soon as possible. I've been saving all my things for her. Everything - crazy Judith Leiber handbags, Manolos - every single pair.

I learned early on that if a designer gave me something and it said 'Kate Moss' in the waistband, I should keep it. And if it's a boy, I'll give it to his girlfriend... if he's heterosexual."

The 44-year-old actress is not the first celebrity to use a surrogate mother to have a baby. Last year, Dennis Quaid and wife Kimberly became the proud parents of twins Thomas and Zoe, who were born with the help of a surrogate.