Alongside a gorgeous unseen snapshot of Meghan, he gushed: "Wishing HRH The Duchess of Sussex a very Happy Birthday".
Kensington Palace shared a photo of Meghan with Harry alongside William and Kate, and the Prince of Wales. "If you talk to the media as he did, I'm afraid that may well cause difficulties foreseeably".
The Duchess of Sussex has had a whirlwind year since her last birthday with her happiest moments most likely including the birth of her son Archie Harrison Mountbatten-Windsor.
The Duke of Sussex posted a loving message to his wife on the couple's Sussex Royal Instagram account - and our hearts just melted.
On Friday, Harry and Meghan asked followers of their SussexRoyal account to submit suggestions about which groups they should follow on Instagram.
Several friends of the couple replied to the post, including Meghan's close friend Jessica Mulroney, who said: "Happy Birthday lovely".
Coincidentally, that also happens to be the name of her character on Suits.
Meghan guest-edited British Vogue's September issue, entitled Forces For Change, bringing together 15 women for the cover, including actress Jane Fonda and environmental campaigner Greta Thunberg.
Meghan Markle may still be struggling with the criticism she faces as a Royal.
This month we turned to you for ideas of accounts to follow featuring people, organisations and causes that you find inspiring or noteworthy.
I have an terrible feeling that Meghan needs to understand things she doesn't yet understand.