“Prince Harry and Prince William did an impromptu walkabout outside of Windsor Castle, where royal fans have already set up camp ahead of tomorrow’s festivities,” People said.

In the video, Prince Harry and Prince William can be seen emerging from the castle gates and then walking up directly to fans to greet them on May 18.

Prince Harry and Prince William shake hands, pose for photos and take the time to chat with royals fans who are eagerly awaiting Meghan Markle and Prince Harry's and wedding on May 19.