Sarah Ferguson and Princess Diana used to have a close relationship with each other, but there was one thing about their friendship that they hated the most.

In the book “Sarah: HRH The Duchess of York,” royal author Ingrid Seward said that the Duchess of York was most at ease with the Princess of Wales. And in return, Fergie has been a great support to Princess Diana.

“If there is one thing that both women disliked, though, it is being compared with each other but Sarah values her friendship with Diana and the two women remain close,” Seward said.

One of Fergie’s good friends, Clare Greenall, told Seward that since the Duchess of York and Princess Diana were both in the same position in the royal family, they used to talk to each other about things that their other friends couldn’t relate to.

Another pal of Fergie, Clare Wentworth-Stanley, said that Princess Diana has helped Prince Andrew’s wife more than she has been given credit for. In fact, at the time of her death, she and Ferguson were not in good terms.

The two women had a falling out after Ferguson released her biography. In the book “My Story,” Ferguson said that Prince Charles’ ex-wife gave her several pairs of shoes and plantar warts. The statement didn’t sit well with Princess Diana.

“We were like siblings, we rowed. And the saddest thing, in the end, we hadn’t spoken for a year,” Ferguson said during her interview.

But before Princess Diana died following a fatal car crash in Paris, it seemed as though she was already set on forgiving Ferguson. According to Princess Beatrice and Princess Eugenie’s mom learned from a common friend that Princess Diana had been asking how she was.

Unfortunately, Princess Diana passed away on Aug. 31, 1997, even before she and Ferguson could talk. During a recent interview, Ferguson said that she still thinks of Princess Diana every day.

Princess Diana and Sarah Ferguson
Princess Diana was jealous of Sarah Ferguson because she knew how to win the hearts of the royal family. Pictured: Prince Andrew, Ferguson, Lord Linley, Prince Edward, Prince Charles, Princess Diana, Queen Elizabeth II and Queen Mother outside her London Clarence House residence on Aug. 4, 1989. Getty Images/Johnny Eggitt