It's understood he's keen to build up a library for his nephews Prince Louis and Prince George, 4, and niece Princess Charlotte, 4, in memory of the late Princess Diana.
The Queen and her husband, the Duke of Edinburgh, didn't attend the christening, but it was a decision made "some time ago" and wasn't due to health reasons.
Monday was also the first time the five Cambridges have been seen together.
All six of Louis' godparents and their spouses were, obviously, invited.
When the two were about to approach the Archbishop of Canterbury, William told his two eldest children to give a shake of the hand, after doing so Princess Charlotte and Prince George received a "Well done!" from their father.
Attending the RAF 100 ceremonies was especially poignant for Kate, as she is the Honorary Air Commandant of the Royal Air Force Cadets.
William and Kate were to host a private tea afterwards.
Lucy Middleton is the Duchess' cousin and the sister of Adam Middleton, another of Princess Charlotte's godfathers. While Princes William and Harrylooked smart in coordinating navy blue suits. I don't know why, don't ask me, but whatever the British royal family does, I gaze upon with great interest. And perhaps most importantly, Van Custem's daughter Grace was a bridesmaid at William and Kate's 2011 wedding, where she was famously photographed holding her ears pouting atop the Buckingham Palace balcony. He served as an usher at Will and Kate's wedding. But it was largely hidden behind Prince Louis' christening gown. Pelley was also responsible for planning Prince William's bachelor party.
The 11 weeks old prince, who was born on April 23, 2018, was taken to the Chapel Royal in St. James's Palace in London for christening.
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