The royal rift seemed to happen late past year and things intensified after Meghan and Harry split their joint charities from William and Kate a few months ago.
"It is testament to Meghan that she has been given this invite".
"Thank you to each and every one of you who contributed!"
Charles, 70, along with his wife Camilla, the Duchess of Cornwall, also shared a series of snaps featuring Meghan on Clarence House's page, writing: "A very Happy Birthday to HRH The Duchess of Sussex". In celebration of the Duchess of Sussex's birthday, we take a look at how these two love birds sealed their relationship with a kiss.
One person responding on Twitter wrote: "Pure class Kate and William are!"
However, the Sussex couple faced backlash last month when they commented on a cute image and message shared by the Kensington Royal account to celebrate Prince George's sixth birthday.
The Duke shared his loving words with the couple's 9.2million followers alongside a attractive photo of Meghan, which was taken previous year at the Queen's Commonwealth Canopy in Tonga.
This morning, The Duke and Duchess of Sussex's son, Archie Harrison Mountbatten-Windsor was christened in the Private Chapel at Windsor Castle at an intimate service officiated by the Archbishop of Canterbury, Justin Welby. Like Harry and Meghan, Edward and Sophie decided not to raise their children as "prince and princess" because they wanted them to have a private childhood away from public scrutiny.