The young fan had been to see the Changing of the Guard parade at Windsor Castle dressed in his own soldier outfit.
But to his surprise, one of the soldiers who walked past him came back out of the castle and walked towards him.
The soldier gestured for the boy to come towards him.
The toddler immediately saluted him, then stood next to him to pose for a photo. He’s the cutest little soldier we’ve ever seen at a Changing of the Guard parade.
It has been viewed more than 2.4 million times in one day since it was posted on Thursday 5 January.