They sent royal fans into a frenzy after finally announcing their engagement last year.
And now Prince Harry and Meghan Markle have delighted fans once again by sending out official thank you cards to their well-wishers.
After being inundated with handwritten notes and letters, the newly-betrothed couple posted thank you notes via Kensington Palace, saying that they were "incredibly touched" by the reaction.
The cards, which are now circulating on social media, feature the official Kensington Palace crest alongside a photo of the couple, and a short note thanking fans for their "thoughtful" messages.
An image, shared on Instagram by @ParkysPrincess, shows the inside of the card which reads: "Prince Harry and Ms. Meghan Markle were incredibly touched that you took the trouble to write as you did in connection to their forthcoming Wedding.
"It really was most thoughtful of you and greatly appreciated. His Royal Highness and Ms. Markle send you their warmest thanks and very best wishes."
The image of the card, which was originally sent to Lauren Parkinson, was shared online alongside instructions on how royal fans could receive one themselves by writing to the couple at Kensington Palace or Clarence House.
The message inside follows almost the exact same format as a card sent by the Duchess of Cambridge in February last year where she thanked fans for their birthday wishes.
Kate also sent her "warmest thanks and best wishes" and said she was "touched" by the messages she received.
Some fans have suggested the card represents a break with tradition as it is unusual for a non-royal's name to appear on official correspondence from the Palace - however, others pointed out that similar cards were sent out when the Duke and Duchess of Cambridge got engaged in 2010.
Kensington Palace has been contacted for comment.
It is not the first time Harry, 33 and Meghan, 36, have personally thanked fans for their well wishes.
When portraits from their official engagement shoot were released last month, the couple released a bonus "candid" photo, thanking fans for the "warm and generous messages they have received during such a happy time".