The similarities show how Princess Charlotte is a mix between the Cambridges and the Spencer side of the family.

An Instagram user wrote: “Kitty is Charlotte!”

Another added: “I thought it was Princess Charlotte.”

Kitty wrote in the caption: “29. Thank you for such beautiful and kind birthday messages today. I couldn’t have asked for a better day surrounded by the people I love. Thank you to everybody who made it the most special birthday I can remember (although this Barbie party looked pretty cool too!)”