I think that when you're an actress, you have to think about what kind of a role model you're going to be. I hope that I'm a good role model for young girls. I'm not going to, if people still want me in their movies, I don't want to be one of these girls who goes around partying every night and is in rehab. I don't want to do that.

Ivo van Hove is directing The Crucible, and rehearses in quite an unusual way. We started rehearsals last week and dived straight into the first act, like, five minutes after we all turned up. No warm-ups. We were very intensely immersed in that whole world on day one. It was quite surreal because I've never done any theater before.

I don't feel isolated on a film set. In a way you do because you don't really mix with the outside world; you're just sort of working non-stop for a few months, but you've got so many people around you.

What we do every St. Patty's day, which is wear green and drink a lot of Guinness. And maybe cry a little bit and laugh, and everyone will have to sing a song. That's how every funeral, christening, and wedding ends up in Ireland. Everyone ends up having to sing a song by the end of it.

I would never want to move to L.A.

I'm Irish, so I'm messing all the time. Which means, I'm having a laugh. I'm always making jokes.

Sometimes the director will want you to write about the character, sometimes he'll want you to live in the location that the character is from or something like that, but I don't usually make a lot of notes or anything like that.