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Keira Knightley Is Officially A Mum

Yay, babies!

Serious congratulations are in order for Keira Knightley -- because, if the actress joins Twitter and a bunch of randos scream "MOM" at her, they will finally be correct. Knightley and her husband, the musician James Righton, have officially welcomed their first child, E! confirms.

No news yet as to the gender or name of the baby, but we do know that couture maternity gowns look seriously fierce on Knightley, who was nominated for an Academy Award last winter for her work in "The Imitation Game":

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Stay tuned for more news on Knightley, baby, and what will surely be a barrage of magazine covers speculating about her "post-baby body."