Sarah Jessica Parker & Matthew Broderick arrive for her 40th partySarah Jessica Parker and Matthew Broderick Some news in showbiz knocks us for six.

Sarah Jessica Parker has done exactly that with her latest announcement.

The 44-year-old actress has confirmed she and husband Matthew Broderick are expecting twin girls this summer.

The stars' publicists revealed the couple will be welcoming the baby daughters via a surrogate mum.

In a joint statement, SJP and Matthew's reps 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".

The new arrivals will be sisters to the duo's other child, six-year-old James Wilkie.

Clearly, we're brimming with excitement at this surprise development.

Who knew SJP and family would soon be joining the ranks of Brange, J.Lo, Jenna Jameson and co. - aka the rapidly expanding celeb twin parents posse?

One thing's for sure, with the SATC babe as their mummy, the two girls will be the best dressed tots in the whole of Manhattan and beyond.

Our biggest congrats to SJP and Matthew - and their soon to be family-of-five.