The 17-year-old superstar, who grew up in a basement flat in Canada after his father walked out on his 18-year-old mother, is said to believe his troubled upbringing would help him play the part well.
He told The Sun: 'That place was really dirty. We had mousetraps everywhere because there were mouses - uh, mice - in the house. I didn't have a real bed. I slept on a blue pull-out couch in my room. We didn't have anything in the fridge, except maybe luncheon meat for school and macaroni and cheese. I'd love to play Oliver Twist.'
But one pitfall might be doing an English accent. He explained: 'I can do it a little bit but I'm not amazing at it. When I try it, it sometimes comes out a bit Australian.'