Pregnant Jessica Biel held onto her growing baby bump while filming scenes for New Girl back in August Credit: PacificCoastNews

Already a protective mommy! Jessica Biel and husband Justin Timberlake may have been keeping their baby news a secret for the past few months, but there was no denying the actress' baby bump as she filmed her guest spot on New Girl in a tight-fitting navy dress on Aug. 4.

While on set, the 32-year-old mom-to-be held onto her growing belly before getting in front of the camera as Jess' (Zooey Deschanel) wedding nemesis. She kept her long brunette locks down and wore her gorgeous wedding ring.

Us Weekly broke news earlier today that the Blunderer actress is expecting her first child with the "Mirrors" crooner, 33. "Right now they are just enjoying the news for themselves," one pal told Us. "They just want a happy baby."

Days leading up to the big baby announcement, the lovebirds threw a John Hughes-themed Halloween bash at their home. They matched in oversized pig costumes in a nod to National Lampoon's European Vacation, which deemed to be the perfect tactic to cover up Biel's baby bump. The hosts were "really nice," a source noted to Us. At one point, dad-to-be Timberlake even got affectionate with Biel and wrapped his arms around her. See pics of Jessica and Justin's sweetest moments.

Soon, the couple will be able to wear coordinating Halloween outfits with their little one too. He or she will also have two special pals to play with. Biel's former 7th Heaven costar and longtime friend Beverley Mitchell, already mom to 19-month-old daughter Kenzie Lynn, is now expecting a baby boy.