In a letter to a friend in 1985, Diana spoke about how she could not wait to open her Christmas presents. She added that she feared her eldest son William had also picked up the habit.
Diana wrote: “I could not resist opening my presents, as a parcel of any shape or form has never been safe with me.
“I fear that William has also picked up this dreadful habit from his mother, as I find wrapping paper undone in the most extraordinary places!”
In another letter written in 1990, Diana revealed how excited William and Prince Harry were for Christmas.
She said: “The boys are thrilled at the prospect of Christmas on the horizon and have searched high and low for any parcels that might be coming their way!”
Diana’s former butler Paul Burrell previously revealed how she looked out for hilarious presents for her sons’ Christmas stockings.
Mr Burrell told the Daily Mirror: “She’d spend hours looking for jokey things for their stockings.
“One year, Harry got fake dog poo.”
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However the next year she was prepared and bought Sarah Ferguson a leopard-print bath mat.
The Royal Family usually spends Christmas at Sandringham in Norfolk.
Huge crowds of wellwishers gather to catch a glimpse of the royals attending church on Christmas Day.
However this year the family occasion was not possible due to coronavirus rules.
The Queen spent Christmas Day quietly with Prince Philip at Windsor Castle.
Other members of the Royal Family were at residences across the country.