Kristen Stewart wants to do Princess Diana's story justice.The actress recently spoke with ET while promoting her new holiday film, , where she also opened up about preparing to play the late Princess of Wales in an upcoming biopic, .«It's a really meditative project,» Stewart said. «There are so many perspectives of her and of her story… it's just not a black and white thing and it's a very slippery, really emotionally-packed story for a lot of people.»While parts of Diana's story have been