Madonna doesn't seem to be too pleased with the news that an unauthorised film is being made about her life.

The singer took to Instagram after it was revealed that Universal had acquired the rights to the script for Blonde Ambition, which covers her early career, to deliver a pointed message.

"Nobody knows what I know and what I have seen," she wrote, along with a photo from early in her career.

"Only I can tell my story. Anyone else who tries is a charlatan and a fool. Looking for instant gratification without doing the work. This is a disease in our society."

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The screenplay by Eylse Hollander is said to focus on Madonna's pre-stardom days in New York. It topped last year's Black List - the annual ranking of the industry's best un-produced scripts.

Blonde Ambition is set in 1980s New York and follows Madonna Louise Ciccone as she moves from her native Michigan and tries to launch her career. 

In 1983, she broke through with her eponymous debut album, which included the hits Holiday, Borderline and Lucky Star.

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Fifty Shades of Grey producer Michael De Luca is on board to produce the film along with John Zaozirny and Brett Ratner, who directed the singer's Beautiful Stranger video in 1999.

With sales of more than 300 million records, Madonna is recognised as the best-selling female recording artist of all time by Guinness World Records.