May 26, 2015 03:15 PM

Jeff Kravitz/Filmmagic

Keira Knightley is a new mom to a baby girl!

As multiple sources confirmed to PEOPLE, The Imitation Game actress and her husband, musician James Righton, welcomed their first child in May. And PEOPLE has now learned that the couple’s newborn is a daughter!

Although PEOPLE confirmed her pregnancy in December, the mom-to-be, 30, kept mum on the news, and let her baby belly speak for itself in the weeks leading up to award season.

But after stepping out several times in gowns that kept her bump under wraps, Knightley — who later joked her “waist had disappeared” — opened up about the perks of pregnancy while walking the Golden Globes red carpet in January.

“Luckily, I don’t have lipstick. I only have nuts in here. It’s the wonderful thing about being pregnant. You just need to make sure you have snacks. So this is a snack bag,” she told Entertainment Tonight of her clutch.

While Knightley and the Klaxons’ keyboardist, 31, opted to keep the sex a delivery surprise, the expectant actress admitted to Ellen DeGeneres that the thought of having a son was frightening.

“Somebody said to me the other day, the problem with boys is — sorry, this is horrible — but when you’re changing their nappies, you can get the wee in your face,” she said during a February appearance.

E! was first to report the news.

— Anya Leon with reporting by Mary Green and Philip Boucher

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