She continues to buck the conventional norms expected of a princess even now, 21 years after her untimely death, in the form of a super dirty joke birthday card she sent her accountant, Anthony Burrows, in the mid-'90s.
The card recently resurfaced as part of a lot that is up for sale at Julien’s Auctions, as part of their "Icons & Idols: Hollywood" sale.
The cover of the R-rated birthday missive features a cartoon illustration of Sleeping Beauty napping in her bed, in a castle, with the joke set-up, "A little prick in the hand sent Sleeping Beauty to sleep."
Inside the card, it reads, "Only the big ones are worth staying awake for!"
Inside the card, under the punchline, the Princess of Wales hand wrote a message for Burrows, commemorating his special day, alongside her valuable signature.
A spokesperson for Julien’s Auctions told The Huffington Post that the card is expected to fetch around $800 to $1,200 and that the auction house is selling the card for a client who obtained it from Diana's accountant himself.
The "Icons & Idols: Hollywood" sale at Julien’s Auctions runs Nov. 16-17.
For more on the life and legacy of the revolutionary princess, check out the video below.