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Sarah Ferguson became infatuated with John F. Kennedy Jr., an upcoming biography on the Duchess of York and her ex-husband, Prince Andrew, claims

Author Andrew Lownie writes that Fergie was "furious" that Princess Diana met JFK Jr. first and said, "He's mine"

A spokesperson for the Duchess of York declined to comment when reached by PEOPLE

Sarah Ferguson once developed a crush on John F. Kennedy Jr. and was "furious" to learn that Princess Diana met him before she did, according to a bombshell new book on the Duchess of York and her ex-husband, Prince Andrew .

Author Andrew Lownie makes the claim in the upcoming biography, Entitled: The Rise and Fall of the House of York , according to a new excerpt published by the Daily Mail on Aug. 4.

Entitled is a joi

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