Meghan threw herself into royal life and was at work with Harry just days after their wedding last May as they joined the Prince of Wales and Duchess of Cornwall at a garden party celebrating the prince's charity work.
In the accompanying caption, their Instagram officials wrote, "We hope you enjoy reliving this moment, and seeing some behind the scenes photos from this special day".
Reportedly Meghan Markle and Prince Harry "massively overshadowed" other Royal Family members engaged on official duties because of the frenzy they generated with the secretive birth of their son Archie, royal correspondent Chris Ship claimed. "Each of you made this day even more meaningful", the Duke and Duchess said on Instagram.
While Meghan has Princess as an occupation, she will never officially be called Princess Meghan as she does not have royal blood.
Also included in the anniversary slideshow is a picture of Prince Harry smiling at the camera while his older brother Prince William follows him down the stairs.
A first wedding anniversary is traditionally celebrated with paper gifts - with couples sometimes exchanging presents featuring a paper ticket.
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Ending the short clip, were the words: "Thank you for making the memory of this day so special".
A third added: "Gorgeous and they look so happy".
Following the May 6 birth of Harry and Meghan's son Archie Harrison Mountbatten-Windsor, Gabriella is 52nd in line to the throne. Congratulations to them both and of course little Archie'.
The PR director bride, who Wednesday financier Thomas Kingston, is the daughter of Prince and Princess Michael of Kent, the former of whom is Queen Elizabeth II's first cousin.
The nuptials were held at Windsor Castle, where Princess Eugenie also Wednesday Jack Brooksbank on October 12, 2018.
On the certificate Meghan's job is listed as "Princess of the United Kingdom".