Princess Beatrice marked her marked her 36th birthday on Thursday and her younger sister, Princess Eugenie, shared the sweetest photos of her older sibling.
Although Eugenie chose to front the post with snaps of herself and Beatice at a trampoline park at the Saudi Arabian city of AlUla, it was the final image that really captured hearts. In the adorable image, Beatrice could be seen being a doting aunt to Eugenie's young son Ernest, who turned one in May.
In the snap, which was presumably taken in Easter, Beatrice surprises Ernest in a pair of bunny ears, while the young tot sits on a blanket by a patch of daffodils. Beatrice's face was a picture of joy as Ernest looked lovingly at his auntie.
Showcasing their bond, Eugenie penned: "Happy birthday dearest Beabea!! What an inspiration you are. You've paved the way for your little sissy. Love you."
Eugenie and Beatrice's bond was also on full display in one of the photos as the daughters of Prince Andrew and Sarah Ferguson jumped for joy while on a trampoline.
Eugenie isn't the only royal to have sent well-wishes to Beatrice on her special day as mum Sarah also shared a sweet tribute.
"Happy birthday my wonderful Beatrice," the Duchess of York wrote. "You are the most amazing daughter, mother, stepmother, sister, wife and woman!
"I feel so privileged to be able to learn from you every day. You continue to inspire me and those around you with your warmth, curiosity, and zest for life. I love you. Happy birthday."
The author, 64, also shared a tender black and white photo of her kissing the top of Beatrice's head in a never-seen-before snap.
It's not yet clear how Beatrice will choose to celebrate her birthday, but when she turned 35 last year, mum Sarah revealed that it was Beatrice's daughter, Sienna, who took centre stage.
The children's author shared that Beatrice and husband Edoardo Mapelli Mozzi threw a fairy-themed picnic for the young, complete with a treasure hunt and fairy wings.
RELATED: Princess Eugenie reminisces about 'favourite memories' with Princess Beatrice throwback