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The couple are expecting twin daughters via a surrogate mother.
"Sarah Jessica Parker and Matthew Broderick are happily anticipating the birth of their twin daughters later this summer with the generous help of a surrogate," the actors' publicists said in a statement.
"The entire family is overjoyed."
Parker, 44, and Broderick, 47, also have a son, 6-year-old James Wilkie.
A source says that the already proud parents had been trying unsuccessfully to expand their brood for some time.