The service will be conducted by the Dean of Westminster but the Archbishop of Canterbury will preside over the service and officially marry the royal couple.
After the ceremony, William and Kate will return to Buckingham Palace in a carriage procession to attend a reception hosted by the Queen.
The couple, whose official engagement portraits were released last month, were recently given special mention as part of the Archbishop's Christmas Day sermon when he referred to the wedding as "a profoundly joyful event".
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