The account wrote, "Just thought I would share this sweet video from William and Kate’s graduation on June 23rd, 2005!
"My favourite thing about this video is Prince Charles’ huge grin when the name of his future “darling” daughter-in-law was called!
"Even The Queen looked over at Charles!"
The video has since amassed over 100,000 views as fans gush over the royal couple, with many claiming that it showcased the royal family's fondness of Kate.
One commented: "I’ve never seen this. How sweet! Thank you so much for sharing."
Another added: "Absolutely adorable ❤️❤️❤️ It's clear how much the family loves her."
A third echoed: "I ABSOLUTELY LOVE THIS, The whole family was so proud of William & of Catherine too."