John Krasinski and Emily Blunt are parents.
The couple welcomed a daughter, Hazel, on Sunday. Krasinski announced the news on Twitter.
"Wanted to let the news out directly," he tweeted. "Emily and I are so incredibly happy to welcome our daughter Hazel into the world today! Happy bday!"
This marks the first child for the couple, who were married in 2010.
Krasinski, best known for his role as Jim Halpert on The Office, recently voiced a role in Monsters University and co-stars in Cameron Crowe's next movie.
Blunt, who recently appeared in Looper, The Five-Year Engagement and The Muppets, next stars opposite Tom Cruise in Edge of Tomorrow and also has a role in the musical Into the Woods.
Wanted to let the news out directly. Emily and I are so incredibly happy to welcome our daughter Hazel into the world today! Happy bday!
— John Krasinski (@johnkrasinski) February 16, 2014