Sarah Jessica Parker and Matthew Broderick

Sarah Jessica Parker and Matthew Broderick are expecting twins via a surrogate.

An unnamed friend of the couple tells EW that Parker and Broderick turned to a surrogate after trying for years to have another child naturally. (Parker, 44, and Broderick, 47, who married in 1997, have a 6-year-old son, James Wilkie.) "They had a lot of unsuccessful tries," says the source. "They came to the conclusion that this was going to be the best alternative for expanding their family."

A spokesperson for the couple confirmed the good news in a statement. The twin girls are due later this summer.