“Thanks to all of those sending love and celebrating her special day!”
The duchess also released an image of a newborn Princess Lillibet looking up at her father.
Another image shows the duke and his daughter in a dress walking bare feet in the sand, with their backs turned to the camera, surrounded by palm trees.
“The sweetest bond to watch unfold,” she said of the pictures. “Daddy’s little girl and favourite adventurer. Happy birthday Lili!”
Meghan usually only shares photos of the princess pictured from behind to protect her privacy, but in one of the newly released photos you can see Lilibet’s eyes and top half of her face, with the bottom half covered by Meghan’s arms as she hugs her daughter.
The princess – the youngest child of the Duke and Duchess of Sussex – was born on 4 June 2021, a year after her parents stepped back from being senior royals and moved to the US.
She became a princess when her grandfather the King became monarch.
The couple also share Prince Archie, aged six.