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.

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.

If oil exploration can threaten a place as beautiful and meaningful as Virunga, where next?

My whole family is quite petite, so I have good genes on my side. But I find it quite tiresome that we have to keep talking about sizes and how much weight we can lose.

There were reports of me using fat-sucking machines and all sorts of silliness. All I did was walk a lot and breast-feed. I've never been on a strict diet. I just don't overeat, and I don't eat if I'm not hungry.

I want more children but for the next three years I want to act.

Well ironically my last three roles have all been a mother. One was a Canadian film where the baby was taken away because she is a drug addict, in Irish Jam I play a mother to a four year old. I think in the future I'll be able to handle the role with a lot more depth.