A HARROWING new film about Princess Diana premiered last night and caused instant outrage among royal experts who said it strips her of dignity.

The movie, Spencer, portrays Diana as an emotionally unstable, broken woman who self-harms and breaks down hysterically in front of young son Prince William. Graphic scenes range from the fragile princess fantasising about throwing herself down the stairs to choking on a pearl necklace gifted to her by husband Charles.

She is shown at the height of a mental health crisis while battling bulimia — reduced to tears as she forces herself to vomit and descends into hallucinations about her own death.