On Wednesday, Prince Andrew took a selfie and posted the image on Twitter.
The royal took the picture at the final of the Pitch @ Palace competition, which was set up to help students interested in launching their own start-up firms.
The Duke allowed mobile phones to be used in the state room at St James’s Palace for the finals of the competition.
This is a unique day at the Palace because we are encouraging you to use your phones and electronic gadgetry.As a result of that I've decided there's a bit of a thing going around about selfies.