Prince Harry and William have arrived at Windsor Castle ahead of his marriage to Meghan Markle.
Ms Markle has also travelled to Windsor from her overnight hotel, and members of the Royal Family have taken their seats.
The ceremony has already begun at noon (Windsor time), before the newly-married couple travel through the town.
Prince Harry has been made the Duke of Sussex by the Queen, with Ms Markle becoming the Duchess of Sussex.
The prince, who is sixth in line to the throne, also received the titles Earl of Dumbarton and Baron Kilkeel.
Thousands of well-wishers are arriving in Windsor, while hundreds more camped out overnight to secure the best viewing spot.