Elizabeth, who was best friends with the 'Bad' singer, loved the documentary - which was pieced together from footage of the 'King of Pop' rehearsing for his sold-out London residency - and has urged everyone to watch it.
She said: "Michael and I shared a pure and perfect love. Usually, I don't speak publically about the loss of a loved one.
"But I am encouraging everyone to please, please see his mastery in 'This Is It'. Michael's genius will never be equalled. Tragically, we shall never see the likes of him again."
The 77-year-old actress also revealed she has Michael's music on her iPod, as well as British singing sensation Susan Boyle.
She added in an interview with the USA Today newspaper: "We're just starting to load my iPod now. I ask my secretary to help me with those things. I have Andrea Bocelli, Enya, Susan Boyle and of course my loved one, Michael Jackson, on it."
Despite constant rumours she is in ill health, Elizabeth insists she is still going strong.
She said: "I've outlived many who have prematurely buried me. There are so many things in the world that are more important than my health watch."
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