Being a mother gives you an incredible feeling of empowerment, you think if I can go through such pain and that level of sleep and still operate and not be grumpy you can do anything. It can be quite scary, you can't function your brain, forget your vocabulary.

And the most important thing - apart from telling a good, believable story, and being a true character - is to be someone the audience will care about, even if you're playing a murderer or rapist.

I look at being an actress as being like a mummy: You're bandaged up and preserved as soon as you start making other people money.

Any scene that involves stripping off is hell. You just know it's going to take a day or more to get it right. It never gets any better and it's always uncomfortable, and all you can do is grin and bare it. I just pray it's never gratuitous and that it doesn't look so fake that all you hear in the audience is, 'Well, that's not really her, is it?'

I'd like to put the record straight about that. I've been labelled an irresponsible role model for young mothers, but none of it is true. I couldn't even walk for two weeks after the birth, let alone exercise. I ate very healthily all the way through my pregnancy and afterwards. I didn't do anything extreme.

When I'm working, it's those actors (you know who you are) who sit around moaning that their trailer isn't big enough, or how bad their facilities are. I can't be doing with any of that, I just like to get on with it.

I'm in a really good place. I used to be a right worrier, but being in a settled relationship has made a massive difference. I was on my own for three years before meeting David. I'm very happy with him, he's a fantastic man. But you never know what's around the corner, so you just hope for the best.