But now, in a newly released Vogue interview she gave before she became a mother, Emily has opened up about her experience of pregnancy.
"It's really the coolest thing that's ever happened to me," said the British-born star, who welcomed Hazel Krasinski on 16 February, "I feel good."
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Pregnancy did takes its toll on the Young Victoria actress to an extent. "I do wake up feeling like my grandmother," she said. "I sleep with a fortress of pillows around me.
"I've got one of those huge C-shaped ones," she added. "My husband calls it Gary."
Emily, who married actor John in 2010, continued filming Into the Woods while pregnant with Hazel, but has since revealed that it conveniently fitted in with her character for a few months.
"I'm playing a baker's wife, so I figured she must eat a lot of buns," she said. "But by the end I was doing a lot of creeping behind trees and hiding behind other characters."
Regarding her pregnancy diet, Emily said that she allowed herself "one coffee a day" and stuck to choosing gluten-free options whenever possible.
"I know everyone rolls their eyes," she said. "But I met a hippie doctor who suggested it, and it's really helped me in the pregnancy."