Angelina Jolie fought back tears as she spoke of how a new role reminded her of her late mother. The actress is in the UK to promote Changeling, in which she plays a single mother whose son goes missing. The movie, directed by Clint Eastwood, tells the true story of Christine Collins, who was thrown into a mental hospital after standing up to the corrupt police who investigated the disappearance in the 1920s. Jolie said the character reminded her of her actress mother Marcheline Bertrand, who died from cancer in 2007. Blinking away tears, she said: Everyone called her marshmallow, you know, as a joke, because she was just the softest, most gentle woman in the world. "She is very much Christine Collings. She was really, really sweet and she would never get angry and she couldn't swear to save her life." She added: "But when it came to her kids she was just really, really fierce, and so this is very much her, and her story.�