Sarah Ferguson and Princess Diana used to be dear friends, but they reportedly suddenly stopped talking to each other for a good reason.

The Princess of Wales found a great friend in the the Duchess of York. In fact, the pair was photographed together at sport events and even on holidays together, prompting many to believe that they were best friends. However, just before Princess Diana's tragic death, they stopped talking to each other.

According to Isabella Sullivan, a journalist for Daily Express, Princess Diana and Ferguson's fallout was due to the latter's confessions in her 1996 book "My Story."

In the publication, Ferguson said that she got a verruca, a contagious and usually painful wart on the sole of the foot, after borrowing Princess Diana's shoes. The People's Princess was reportedly upset that she was even mentioned when Ferguson already promised to not talk about her.

After the story was published, Princess Diana reportedly ended all contacts with Ferguson. The Duchess of York tried to reach out to the Princess of Wales, but all of her efforts were in vain.

In 2011, Ferguson wrote a book "Finding Sarah." In the said publication, she talked about her friendship with Princess Diana.

"Diana was one of the quickest wits I knew; nobody made me laugh like she did," Ferguson wrote. "We took vacations together with our children. Sadly, at the end [of the Princess's life] we hadn't spoken for a year, although I never knew the reason, except that once Diana got something in her head it stuck there for a while."

Ingrid Seward confirmed Ferguson and Princess Diana's friendship. In fact, according to the royal biographer, it was Princess Diana who introduced Ferguson to the Duke of York.

"They were very close," Seward said. "Diana introduced Fergie to Andrew and the first time they were in public together he took her to Royal Ascot."

"Diana was thrilled as at last she had a friend on the inside," she continued. "They did mad things together like stealing the Queen Mum's Daimler and driving it at breakneck speed around the driveway at Balmoral. They laughed, and Diana needed to laugh."