In April, Princess Beatrice and Princess Eugenie took a trip to Saudi Arabia, where Beatrice spoke at a World Economic Forum event. In honor of Beatrice’s 36th birthday on Thursday, Eugenie shared a few never-before-seen vacation photos to her Instagram, along with a caption that revealed her nickname for her older sister.

“Happy birthday dearest Beabea!!” it read. “What an inspiration you are. You've paved the way for your little sissy.”

Two of the photos show the sisters playing on a trampoline among the desert sand dunes in AlUla. A third shows Beatrice in a plot of daffodils wearing bunny ears with one of her nephews.

Though Beatrice occasionally appears at royal events, she is not a working member of the family and works full-time in business development. She is also a patron of the Helen Arkell Dyslexia Charity and a trustee at Big Change, a charitable trust that supports projects with plans to improve the future.

During the Saudi Arabia trip, she spoke on a panel focused on entrepreneurship in the 21st century and how businesses are responding to a climate where social agendas are at the forefront. “What I’m seeing as somebody that’s been working with a lot of entrepreneurs is that they’re really excited to take on this challenge,” she said. “They feel the need to lean into this, move forward to look at some of these changes, and develop new businesses and new ways of doing things.”

Beatrice’s mother Sarah Ferguson also celebrated Beatrice’s birthday with an Instagram post, which praised her skills as a sister, stepmother, and mother along with an old picture of the two hugging. “I feel so privileged to be able to learn from you every day,” she said. “You continue to inspire me and those around you with your warmth, curiosity and zest for life. I love you. Happy birthday.”