Princess Diana and Sarah Ferguson's Friendship
Before Meghan and Kate's Royal Friendship, It Was All About Diana and Fergie
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Princess Diana and Sarah Ferguson were not only childhood friends, but they were also actually related prior to becoming sisters-in-law. Sarah, who is better known by Fergie, told Harper's Bazaar back in 2007, "We were fourth cousins, and our mothers, who went to school together, were also best friends."