Eugenie, who loves to post never-before-seen photos from her family albums, then went on to share another flashback pic of herself and her sister in some rather questionable retro outfits.
"Bea and I are laughing hysterically after contemplating what on earth was in our handbags that day going to church..." Eugenie captioned a snap of the princesses in green and lilac suits, with matching headbands and shoes.
"We quite clearly are loving our full lime green and lilac suits!! The shoes, the headbands... yes to the 90s..." she said, proving she's not above making fun of herself.
Eugenie also uses her Instagram account to share causes close to her heart with her followers.
She recently took to Instagram to promote Plastic Free July with a post to fans.
"This month of July is Plastic Free July," the Princess captioned a series of photos.
"As an Ambassador of Project Zero, I've been working to raise awareness of the consequences of single-use plastic.
"I'm committed to ending my use of it and to do my part to clean up our beautiful world and oceans. I hope we can all do the same.
"What a joy to work with such a dedicated team @weareprojectzero#passonplastic" she said.
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