Helena Bonham Carter says 'Sweeney Todd: The Demon Barber of Fleet Street' is a "portrait of her home life".

The actress - who stars with Johnny Depp in the macabre musical directed by her long-term partner Tim Burton - joked the dark film is a mirror image of her relationship with the filmmaker.

Talking about the movie, Tim said: "I thought it was a light-hearted comedy musical. I thought it was quite funny. If I was an actor the role of Sweeney Todd would be the perfect part for me. You don't have to talk, you don't have to say anything, you just look out the window and look brood and be angry."

To which Helena replied: "That would be a portrait of our home life too."

Tim - who has two children, a one-month-old daughter, and a four-year-old son Billy, with Helena - also revealed he soundproofed the door connecting the couple's two separate houses so he couldn't hear Helena practicing her singing.

Helena said: "I had to practice every day but luckily we live in separate houses. We have a door in-between but the door was always shut."

Tim added: "I had the door soundproofed as well."