Here's why Emily Blunt and John Krasinski tweeted a photo of their daughter

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Their daughter Hazel was born in February, but John Krasinski and Emily Blunt waited three months to show her off to the world.

And when they did, they tweeted a free photo. Their choice was governed by necessity and pragmatism.

"Since having a baby, I am going to get more protective and paparazzi get more aggressive. That’s why John and I tweeted a picture of Hazel. I hated the thought of there being a price tag on my child’s head — and there was. I don't want anyone to get money from a picture of my baby," Blunt told us.

The snap was sent by Krasinski, who is on Twitter, and had a message: "Pics of kids should only come direct from parents. So I'm thrilled to introduce you guys to Hazel!!!"

Blunt is not on Twitter. Nor will she ever be.

"I'm not. I can't. It's not a natural, organic thing for me. I'm forgetful. I'm a daydreamer. I forget to document stuff," says Blunt.

She's not remotely into the whole manic selfie culture of over-documentation.

"I feel like such a grandma," she jokes. "I went to a Bruce Springsteen concert. I looked down at one point and it was just a sea of iPhones. It's just social currency, isn't it?"