To celebrate world penguin day, the royal shared a photo of the two princesses as youngsters attending a sports game, with both a young Beatrice and Eugenie holding tight their own stuffed penguin toy's.
Fans were quick to gush over the sweet pic, with one user writing: "Omg you guys are the cutest & sisters are the best!"
With another user simply commenting: "AWWWW!"
More adorable throwback photos please you two!
LISTEN: This is why Princess Beatrice can't have a big wedding like her younger sister, Eugenie!