The six godparents are all family or friends of Their Royal Highnesses.
The frilled satin dress is a replica of the baptism garment first worn by Queen Victoria's eldest daughter, Victoria Adelaide Mary Louisa, back in 1841.
While attending her little brother Prince Louis' christening on Monday, Princess Charlotte was caught on camera delivering a stern message to photographers.
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After the ceremony, the guests will descend on a private tea afternoon at Clarence House and indulge in some desserts - including a tier from Kate and William's 2011 wedding cake.
The godparents included Hannah Carter, a school friend of the Duchess, and Lady Laura Meade, who is married to Prince William's friend and Princess Charlotte's godfather, James. Princess Charlotte looked precious in a blue dress and matching headband while Prince George sported a short-sleeved white shirt and navy shorts.
Time goes by so quickly, and the little princess, now three, looks more and more like her mom the more time that passes.
Queen Elizabeth and her husband Prince Philip were not present at the ceremony after it was decided "some time ago" that they would not attend for unknown reasons which are not thought to be health related. The new version was made by the Queen's dresser, Angela Kelly.
And finally, Middleton, is, as you'd expect, is a cousin of Kate's.