21/04/2011 15:09 BST | Updated 22/05/2015 10:12 BST

Party Like It's 1981!

In the run up to the event of the year, we remember the royal wedding of 1981, when Princess Diana married Prince Charles at St Paul's Cathedral. Will the crowds dress up in union jack outfits for William and Kate's wedding? We hope so. Take a look through some of the best moments from that day below.