Kristen Stewart completely committed to transforming into the tragic icon, between changing up her look to resemble Diana, along with taking on her British accent, which even led to her falling asleep to the sound of her voice. There’s been a number of Princess Diana performances over the years, most recently with the latest season of The Crown, but Stewart’s version has an interesting twist. As the film’s director Pablo Larraín shared:
Article source: https://www.cinemablend.com/news/2573002/how-kristen-stewart-princess-diana-movie-spencer-approaching-accuracy