I'm sure that my father becoming seriously ill when I was 14 had a lot to do with my going from chubby to fat.

I watched what I ate for a bit and did a bit of exercise. I wanted to look alright because I knew I had to take my clothes off and I knew I was starring alongside some extremely attractive women! I think it was Humphrey Bogart who said that the only reason people found him attractive was because of the attractive women he played opposite. So, as audience member you go: "Well, if she would find him attractive, then surely I must too!" Playing opposite beautiful actress of the calibre of Rose Byrne and Anna Faris is amazing - it does a lot of the work for you.

Doing Prometheus was what you imagine being an actor is like when you're five. In a spacesuit, on another planet, getting killed by an alien. It was a real treat, it felt like being a part of movie history.

I'm sure that my father becoming seriously ill when I was 14 had a lot to do with my going from chubby to fat.

Because I was always a fat child, I got fatter and fatter, and I ended up 18 stone and with a 40-inch waist.

For a man, there's a big responsibility that comes with having a boy because men are made by their fathers. If you've got a good productive man around it's better. I have such a close relationship with my dad and that responsibility to produce a good man is something I think about.

My biggest ambition over everything is to have kids. It feels great. I'd love a big family.