A rep for the actress confirms to PEOPLE that the couple are expecting their first child in just a few months.
Blunt, 30, and Krasinski, 33, were married in 2010.
“Meeting John really changed my life,” Blunt, who will play the Baker’s Wife in the movie adaptation of Stephen Sondheim‘s Into the Woods, told InStyle in April.
“When I feel the support I have from him, I feel invincible. There’s someone behind you on your good days, and someone in front of you on your bad days.”