Saoirse Ronan has admitted she feels older and wiser beyond her years, like an "old soul".
The Oscar-nominated actress, who has won critical acclaim for her performances in Atonement and Hanna, finds it easy to relate to her vampire character Eleanor in Byzantium, who has been existing for over 200 years.
"I think Eleanor is very much an old soul and not only stuck in the past but I think she's quite fascinated by the life she's had before. I do feel like a bit of an old soul sometimes so it was just nice to tap into that really," said the 19-year-old.
"She's still very different and I think that's why it was such a pleasure to play," she added.
Saoirse enjoyed working with her co-star Gemma Arterton, who plays her screen mum Clara.
"I had never met Gemma before and loved her straight away. She's funny and very laid-back and I like that she is so relaxed on set yet she takes it very seriously," she said.
"She's very professional. She brings this really great energy to every scene. It was great to see her play someone like Clara because she's so feisty but she's a real woman and very much a mother at the same time. I really liked that juxtaposition between those two roles."
The actress added: "She's got a real maternal instinct as well, which I think helped for us to get along even better from the off. Whenever you're on a film, people want you to go bowling or whatever to bond but you do that rehearsing with someone or having lunch with someone."
:: Byzantium opens in cinemas on May 31.