“Happy Birthday! Wishing you a very special day and lots of love!", the Dyke and Duchess of Sussexwrite on a one of the ohotos od Geogge.
But that wasn't the only complaint.
Meghan and Harry's Instagram comment drew mass criticisms online, with many royal fans expressing their anger at the fact that George was not called his proper title in the controversial birthday message.
"You mean HIS ROYAL HIGHNESS PRINCE GEORGE!!!", a fan commented.
Another wrote: "If the real royals can call him Prince on official pages, she (a yacht girl) better address this Future King with the right title."
Despite the floods of negative comments, there were plenty of those online who stuck up for the Sussexes.
On fan implored: "STOP!!!! She is wishing him a happy birthday!!! They do not deserve all the abusive comments!!"
While another wrote: "You are an amazing uncle and aunt. George is very lucky boy".