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Alexandra Burke and Tom from McFly are among the stars to tweet their congratulations to William and Kate.
Taio Cruz is the first, but certainly won't be the last star to tweet his congratulations to William and Kate on their big day.
Taio Cruz was up early to tweet, "@TaioCruz. Best wishes to HRH Prince William & Miss Catherine Middleton today. Congratulations"
Alexandra Burke added, "The day is finally here. The royal wedding !!!!! :)"
Mollie from the Saturdays Ahhhh it's THE WEDDING of all weddings!!
Nathan from The Wanted: So we have just had a few rather excited visitors and apparently we are having a british tea party when we are watching the #royalwedding! x
Tom from McFly: Wish I was a Prince.
Sir Elton John, David and Victoria Beckham, Prince William's uncle Earl Spencer and Prince Harry's on-off girlfriend Chelsy Davy are among the many famous faces in the congregation.
Westminster Abbey has been transformed for the occasion, with a towering avenue of delicate English field maple trees along the nave. The scene inside is one of celebration, as guests dressed in an array of brightly coloured dresses and uniforms, many with elaborate hats, chat excitedly.