Tragically, Diana infamously died in a Paris car crash aged only 36-years-old back in 1997.
However, her life was spiraling out of control long before then.
Speaking in the UK Telegraph newspaper Morton claims following the 'Princess of Wales playbook' has backfired on the Duchess of Sussex.
He said: "When she was a teenager Meghan talked one day about being 'Diana 2.0' but for now she is more accurately described as Meghan 1.0."
Actor George Clooney recently drew comparisons between Diana and Meghan saying he was worried about the attention the former Suits actress was getting.
But Morton believes that Diana was actually more actively pursued by the paparazzi.
He said: "Both William and Harry have aggressively used privacy legislation and other legal arm twisting to keep unwanted photographers at bay."
However, he believes that many of the comparisons between the two are valid.
"Both women shared a humanitarian mission, both charismatic, their glamor offset by a spiritual dimension, a profound belief that they had a calling to use their position to make a difference." he added.
Morton has sympathy for Markle when it comes to her estranged family - although he feels she could have tried different tactics.
He said: "Meghan has been cursed with a family from hell and they are not going to release her from purgatory easily.
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"And don't think for a second this family feud is going to end anytime soon."
Morton thinks that Markle could learn from Diana's mistakes when it comes to dealing with the Royal Press Office and the media in general.
"Meghan asked the Press Office to deny the drift of negative stories – but she was confronted with the age-old palace argument that if they denied one they have to deny them all," he revealed.
This must have been even more frustrating for the actress as before marrying Prince Harry she had a huge following on social media that she could personally influence.
Morton believes that unlike Princess Diana the American beauty must learn to choose her battles more carefully if she is going to survive the Royal household and public scrutiny.
Having a tantrum with Kate Middleton over Princess Charlotte's dress for her wedding when The Queen had to intervene was a big mistake on her behalf.
Morton added: "She will have to learn a great del from the tumultuous events of the last few days."
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