A handful of fans congratulated the proud dad-to-be as he exited the stage door of the American Airlines Theatre after his performance of The Philanthropist.
"Thank you!" Broderick answered with a grin before stepping into a waiting car. The fans, it seems, learned the baby news before many of the couple's friends and colleagues.
"That's great news. I didn't even know about it," said Philanthropist costar Steven Weber, as he left minutes before Broderick. "[I'm] shocked!"
"I didn't know that! That's great!" said Sex and the City costume designer Patricia Field, who immediately envisioned the task of hiding Parker's pregnancy from the camera for the upcoming film sequel.
Told the couple was using a surrogate to carry the twins, Field, who spoke at the H&M Celebrates Matthew Williamson party on The Majesty yacht at the South Street Seaport in New York, breathed a sigh of relief, saying, "Oh, good!"
Love Being ParentsFriends of the couple say that while the news came as a surprise, it was, in a way, also expected. "They love kids and wanted more," says one friend. "They absolutely love being parents."
Adds another close pal: "They are very happy. They've wanted to become parents again for a while."
There is only one thing to worry about now, says Field: How to divvy up Parker's fabulous wardrobe and Manolo Blahniks for the future fashionistas. "It's going to be interesting," mused Field. "I think that she could have fierce daughters. Fierce daughters!"
Meanwhile, at the Tribeca Film Fest after-party at Bar 675, one partygoer observed the couple to be "in a great mood." "They were tucked into a corner throughout the night. [And] didn't leave each other's side for most of the night until she left. All the rumors of a breakup weren't true. But no one mentioned anything about [babies] and no one talked about it. It's crazy."
The source added: "It's rare to find a couple who has stuck together this long in Hollywood. They were very romantic and very sweet to each other."
Reporting by AMANDA FRIEDMAN and CARLOS GREER