Princess Charlotte looked precious in a blue dress and matching headband while Prince George sported a short-sleeved white shirt and navy shorts. From leading the bridesmaids at the Duke and Duchess of Sussex's wedding to that perfected princess wave, the 3-year-old is certainly shaping up to be a natural ruler-of the paparazzi, that is.
William encouraged George and Charlotte to "shake hands" with the Archbishop of Canterbury, before telling her: "Well done". And honestly, same. Watch the full video here.
Kate's sister, Pippa, also wore floral stud earrings for the occasion, opting for a modern gold style unlike Kate's pearls.
The queen, dressed in a royal blue outfit with turquoise edging, later hosted a ceremony to present the RAF with a new Queen's Colour, at which she recognised the service's work.
However, the decision for them not to attend Louis' baptism at St. James's Palace in London was understood to have been mutually agreed by the sovereign and the Duke and Duchess of Cambridge some time ago, and was not health-related.
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"I'm delighted and privileged to be christening Prince Louis today - a precious child made in God's image, just as we all are", Archbishop Justin Welby said on Twitter before the ceremony.
Kate Middleton is the queen of recycling fashion, and we love her for it. Looking radiant as she carried her third child, asleep in her arms while clad in his storied christening gown, the proud mom kept with her sartorial tradition as she turned up in a cream Alexander McQueen ensemble and a Jane Taylor headpiece.
It was worn for all royal christenings until 2008, when the Queen commissioned her dressmaker, Angela Kelly, to make a replica in order to preserve the original, the Palace said.
Kensington Palace reports that following the service, Wills and Kate hosted a lovely tea for guests back at Clarence House.
Three-year-old Charlotte grabbed the headlines when she walked hand-in-hand with her dad past all the press that were waiting outside the chapel.