Emily Blunt says motherhood is the ''best thing'' she's ever done.

The 31-year-old actress has nine-month-old daughter Hazel with husband John Krasinski and the brunette beauty admitted becoming a mum is ''heaven'' and like nothing she has ever done before.

She told PEOPLE magazine: ''It is that and more. I know that everybody says that. Everybody says, 'Oh it's the best -- it's the best thing ever!'

''You don't know what to expect because it's just completely, existentially out of anything that you've ever experienced before, and it's quite indescribable.''

As well as doting on her little one, Emily - whose 'Into the Woods' character's, the Baker's wife, biggest wish in life is to be a mother - recently revealed her daughter has become her latest singing critic as she has spent time belting out huge Otis Redding hits to her.

She said: ''I like to sing old standards to my baby daughter.

''Some of my favourites for Hazel include songs by Ella Fitzgerald and Otis Redding. She seems to like them.''

But it's not just Hazel who is a big fan of her mum's musical talents as Emily admitted her husband and fellow actor John, 35 - who she married in July 2010 - also loves to hear his wife's dulcet tones.

She added: ''I think John likes to hear me sing songs to Hazel. He has to like them!

''It is just wonderful being a parent.''