Lindsay Lohan was the 'It' girl from, like, 14. That's a lot of pressure.

I've basically grown up with Harry Potter, as so many kids my age have. It's kind of a part of my life.

When I was younger, I was very athletic and I always loved sports and physical things.

My name means freedom in Irish.

I've always been quite an active person especially when I was younger. When I was in primary school, I used to play lots of sports. I was a sprinter and I did basketball and swimming and Gaelic football and things like that. So I always thought, I guess, that it would be fun to incorporate that much physical activity and work into a dramatic piece.

When I was younger, I would mess about and have a laugh with everyone. I was doing Atonement when I was about 12, and as we went to do this very serious scene, the director Joe [Wright] came up to me ... I'd been giggling right up to the beginning of the take. And he came up to me and said, "Okay, you need to be serious now." I completely idolized him.

I certainly don't feel like I am desperate to run away from a film set. I love the hustle and bustle. Everything is sort of mad right before a take, and then it just settles, and you've got these two minutes of a bit of magic. I just love that in film.