"That awkward moment when you first open your mouth and start to sing is terrifying," the Daily Telegraph quoted her as saying. The 30-year-old star, who co-stars with Nicole Kidman, Penelope Cruz, Judi Dench, Fergie and Sophia Loren, beat Anne Hathaway and Sienna Miller to land the role.
She further told Oprah Winfrey in a TV interview that being a part of the project was "maybe (her) best experience to date". She added: "I look at everything on a project-to-project basis. I''m a spontaneous person so, when I approach anything, I try not to think too much. I am an instinctual being, so I approach with my instincts - that''s my thing."