Kate Mara confirmed she's expecting her first child at an Oscars party.
Mara showed off her growing belly in a white Giambattista Valli lace minidress. She shared a photo from the party Sunday on Instagram and confirmed her pregnancy in the caption.
"Went on a date with our bun in the oven," the former "House of Cards" star wrote.
Entertainment Tonight reported Mara's pregnancy in January after the actress attended the Golden Globe Awards.
Bell is already parent to 5-year-old son Jack with his ex-wife, "Westworld" star Evan Rachel Wood.
Mara previously told Us Weekly she loves kids and enjoys being a stepmother.
"Family is everything to me and I like being surrounded by lots of kids and family at all times," she added.
Mara, the sister of actress Rooney Mara, met Bell on the set of the 2015 remake of "Fantastic Four." The couple married in July 2017.