As a child, I never heard one woman say to me, "I love my body". Not my mother, my elder sister, my best friend. No one woman has ever said, "I am so proud of my body." So I make sure to say it to Mia , because a positive physical outlook has to start at an early age.

I don't go to the gym because I don't have time, but I do pilates workout DVDs for 20 minutes or more every day at home.

I have wrinkles here, which are very evident. And I will particularly say when I look at movie posters, 'You guys have airbrushed my forehead. Please can you change it back?' I'd rather be the woman they're saying 'She's looking older' about than 'She's looking stoned.'

When I think about somebody like Keira Knightley, whom I don't particularly know, I see somebody who is working hard, really trying to challenge herself and make smart choices in spite of people criticising her size and performances.

I knew it was going to be important that if I had an audience understand who she was, then all those things had to come from a place that was grounded, as opposed to being tics and manners and twitches. I didn't think it was going to be as rich, perhaps, as if I was going to make it more emotional.

My husband is not a jealous person in any way.

That's the main reason I took it up But I do feel I don’t know part of, I suppose, my way out of everything, has been really taking care of myself. I think that comes from an awareness that my children really need me, and they need me to be the healthiest version of myself that I can possibly be.