The 30-year-old "The Devil Wears Prada" actress gave birth to Hazel Sunday and Krasinski was eager to share the news.
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
Blunt and Krasinski married in 2010 after two years of dating.