While Diana may have pulled off the ultimate holiday prank that year, her first Christmas with the Windsors didn't go quite as smooth. Reportedly unaware of the royal family's silly gift-giving tradition, the late princess broke royal protocol by buying her new family members expensive presents.

In an exclusive interview with 'Marie Claire,' Paul Burrell says "you could hear the squeals and laughter" from Diana and her sons.

Princess Diana once shocked an audience by stepping out on stage during a charity event and performing a surprise routine to "Uptown Girl" for Prince Charles. No one except Allan and famed dancer Wayne Sleep knew about her plan, but as viewers of The Crown know, the secret performance totally backfired.

A royal expert revealed that Charles said he was too focused on "duty" and "neglected" his marriage in the process.