The big day for the much-anticipated Royal Wedding has arrived. 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 some photos of the arrivals.