Video: The Royal Wedding

Kate Middleton and Prince William will say "I do" on April 29! The whole world has been buzzing about their fairy-tale romance for months, but what can you expect once the big day arrives? We're walking you through it, step by step. Get the scoop on everything from Kate's dress to the celebrity guests — plus where you can watch the special ceremony. We'll be giving you all the royal wedding action live on PopSugar during, too, and will be doing tons of postshow coverage of all the fun!