Purporting to tell the story of the late Princess Diana's romance with UK-based Pakistani heart surgeon Hasnat Khan, the movie has been dismissed by Khan as "based on hypotheses and gossip".
Some scenes in the film depict incidents already widely reported in British media such as Khan being smuggled into Diana's Kensington Palace London residence lying on the backseat of her car covered in a blanket or Diana meeting his mother in Lahore in Pakistan.
In the absence of testimony from Khan, the film is necessarily controversial as it draws on author Kate Snell's 2001 book "Diana: Her Last Love" with which Khan did not cooperate.
It suggests that Diana had been dating Dodi Fayed, who died with her in a car crash in Paris, in order to make Khan jealous following the break-up of the relationship, a claim disputed by many close to her.
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Sixteen years earlier, as Lady Diana Spencer, she was catapulted to global fame when she married heir to the British throne Prince Charles in a "fairy tale" ceremony at St Paul's Cathedral.
But as the world's most photographed woman, she ultimately fell victim to an increasingly rapacious paparazzi.
After her death, then Prime Minister Tony Blair memorably described her as "Queen of People's hearts". Many thousands of people lined the streets of London for her funeral which was televised around the world.
"I felt like I was spending a lot of time with her. There was one particular moment when I felt her permission was granted," the actress told Britain's Mail on Sunday newspaper.
The British-Australian actress later stormed out of a promotional interview with BBC radio, apparently offended by some line of questioning.