In the sweet snap, a young Eugenie can be seen smiling as she attempted to juggle some coloured balls, while a man in a clown costume crouches next to her.
"#tbt to when clowns weren't scary... Happy Halloween 🎃" Eugenie captioned the photo, as #ThrowbackThursday this week coincided with Halloween.
Eugenie has shared a number of flashback photos with her Instagram followers.
From photos of herself and her sister Beatrice, 31, wearing hilarious matching suits as teenagers, to pics of her parents, the Duke and Duchess of York, before their divorce, nothing is off limits for the young royal.
Eugenie, who married Jack Brooksbank in October 2018, has also told followers how much she is looking forward to the wedding of her elder sister, Beatrice next year.
The proud sister posted a gushing tribute to Beatrice and her fiance Edoardo Mapelli Mozzi on her Instagram, alongside a photo of the happy couple and a statement from Beatrice herself.
"Beabea - wow! I'm so happy for you my dearest big sissy and dear Edo. It's been a long time coming and you two are meant to be. 📷 by me!!," Eugenie wrote.
While Beatrice, whose own Instagram account is not public, added a statement from herself and her beau.
“We are extremely happy to be able to share the news of our recent engagement. We are both so excited to be embarking on this life adventure together and can’t wait to actually be married. We share so many similar interests and values and we know that this will stand us in great stead for the years ahead, full of love and happiness,” she wrote.