A representative for the 29-year-old actress confirmed the news to Elle UK on Friday morning after the rumour mill went into overdrive earlier this week. The spokesperson said Keira would not be making any further comment.
Speculation the actress is expecting was sparked on Sunday night when she arrived at the Moët British Independent Spirit Awards in a 'loose-fitting' embroidered dress (by Simone Rocha, btw), and refrained from drinking alcohol.
A source told America's Star Magazine the pregnancy wasn't planned, saying, "Keira and James are thrilled. This wasn't planned, but that is how they wanted it."
And don't worry, it looks like Keira fully intends on being a working mum, so we won't lose her from the big screen.
In a recent interview with American Vogue, she said,"Would I want to be a stay-at-home mother? No. On the other hand, you should be allowed to do that, as should men, without being sneered at."
Keira first started dating Klaxons musician James in February 2011, and the pair were married in an intimate ceremony in the South of France in May 2013.
It appears it's good news all-round this week for Keira, who has just been nominated Best Supporting Actress at the 2015 Golden Globes for new film The Imitation Game.
See more of the Hollywood star below: