The famously private actress shuns sites like Twitter and Facebook, and she has decided to issue a blanket ban on her teenage daughter Mia and 11-year-old son Joe's online use to avoid the negative comments youths are often subjected to on the Internet.

The Steve Jobs star is particularly fearful about the impact such negativity could have on Mia, telling Britain's Sunday Times' Culture magazine, "It has a huge impact on young women's self-esteem, because all they ever do is design themselves for people to like them. And what comes along with that? Eating disorders. And that makes my blood boil. And that is the reason we don't have social media in our house."

It's not just social media Kate and her husband Ned Rocknroll are not fans of - they are also trying to cut down on their use of technology altogether and have promised to keep their phones and tablets away from their bedroom.

"We practically kiss them (the phones) goodnight," she says.