The 32-year-old, who has also played Kim Burgess on TV in Law & Order: Special Victims Unit, Chicago P.D., Chicago Fire, and Chicago Med since 2011, announced the news with a sponsored Instagram post for a stroller company on Wednesday (15Feb17).

Under a picture of herself smiling and rubbing her baby belly next to a Mima stroller, she wrote: "SURPRISE! It's been hard to keep the secret, but since @MIMAUSA sent me the COOLEST stroller (& matching bag) in the world, I thought: what better way to tell you all the news?! (Don't be surprised to see Burgess holding a LOT of file folders in front of her stomach on #ChicagoPD.) #expecting #MIMA #babyonboard."

Squerciati is due in April (17).

Marina, who played Alessandra Steele on Gossip Girl, is married but has not revealed the name of her husband.