'Sex' star having surrogate twins

Broderick and Parker already have a son named James Wilkie

Sex and the City star Sarah Jessica Parker and her actor husband Matthew Broderick are expecting twin daughters through a surrogate.

The couple, who already have a son aged six, are "overjoyed", said a statement from their publicists.

The babies are due to arrive "later this summer", while no further details of the surrogate mother or her pregnancy have been revealed.

Parker, 44, and 47-year-old Broderick have been married for almost 12 years.

The pair are "happily anticipating the birth of their twin daughters later this summer with the generous help of a surrogate," said the statement.

Parker is best known as Carrie Bradshaw, the chief character in the long-running TV comedy drama and its big screen spin-off, which was released last year.

A sequel to the movie is expected to come out in May 2010, according to makers Warner Bros, and will reunite its four main female actresses.

The first film made $415m (£281m) at the box office around the world.

Broderick's main credits are the Broadway and film productions of The Producers, and the comic movie Ferris Bueller's Day Off.