Emily Blunt and John Krasinski have revealed they are "so incredibly happy" to become parents to a baby girl.

The couple are now proud parents of a daughter named Hazel, after the actress gave birth on February 16.

"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!" new dad John tweeted.

Emily and the former Office star got married in Lake Como, Italy, in 2010 after dating for two years. They announced they were expecting their first child together last September.

The English actress celebrated Hazel's impending arrival at a star-studded baby shower in Los Angeles on December 15, with celebrity friends Jennifer Aniston, Justin Theroux and Kristen Bell.

The 30-year-old previously admitted she was feeling broody.

She told Manhattan magazine in 2012: "We want to have children; I just don't know when yet. I'm just not sure about the timing of all of that. We're both from big families, so I think it's something we want."