The Royal Wedding's best kept secret has been Kate Middleton's dress. It was confirmed that her dress was designed by Sarah Burton, head designer for Alexander McQueen. It's a beautiful white gown, with lace on the top and the arms. Today, Prince William and Kate Middleton tie the knot. The distinguished guests of the wedding started arriving early. From princes and princesses to Elton John and David and Victoria Beckham, this wedding was much anticipated by the whole world. Hundreds of people lined the streets of London to catch a glimpse of Prince William and Kate Middleton. The broadcast began in the early morning by the BBC. The Royal Wedding will also be broadcast live on YouTube. YouTube's live stream will focus on the wedding procession and the marriage ceremony at Westminster Abbey as well as the balcony kiss. Here are photos of Kate Middleton arriving to Westminster Abbey.