Prince George (centre) stands outside Westminster Abbey ahead of the ceremony.
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Prince William's eldest son was joined by his siblings Louis and Charlotte.
They were seen chatting ahead of the ceremony.
St Edward's Crown will be placed on King Charles's head shortly before 1pm.
A flypast will take place over Buckingham Palace, with numerous royals set to pose on the balcony.
Charles entering the Abbey.
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Getty
Prince George is one of four Pages of Honour at the ceremony.
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Alamy
A bird's eye view of the Abbey as the King enters alongside Queen Camilla.
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Getty
Charles and Camilla are pictured sitting at Westminster Abbey.
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Getty
St Edward's Crown arrives at Westminster Abbey. It will be placed on the King's head at the end of the ceremony.
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Getty
Prince Harry Sits Third Row at King Charles's Coronation