The nation is in coronation fever with thousands descending on the capital to watch the historic moment with many already gathering around The Mall.
Ahead of the big day, HELLO! headed down to The Mall to find out how much about the Royal Family these superfans really knew. Click on the video below to see how they get on and whether they know the answers to questions like 'What is Prince Harry's real name?' 'Is King Charles half-Greek?' and most importantly 'Which royal once sang a duet with Taylor Swift?'
Sadly, no prizes can be given out, but just as we were impressed by these superfans' knowledge, we'd be impressed if you got them all right as well!