Prince Harry and Prince William made an unexpected appearance today ahead of tomorrow's Royal Wedding! Thousands are already lining the streets of Windsor to get a glimpse of Prince Harry and Meghan Markle when they get married tomorrow, so the princes took some time out to greet all the spectators! How cool! You can see someone took a little video below. Someone commented that Harry looked a little nervous and was subdued before his big day. That would be understandable though. To read more on their special appearance click HERE!