William's father Prince Charles and his wife Camilla were present along with younger brother Prince Harry and his wife Meghan.

Also attending were Kate's parents, her brother and sister and Louis's six godparents, who are close friends or relatives of William and Kate.

They include Kate's cousin Lucy Middleton, Nicholas van Cutsem, whose daughter was a bridesmaid at May's wedding of Harry and Meghan, and Guy Pelly, a childhood friend of William's.

"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 of Canterbury Justin Welby said on Twitter. "Please join me in praying for him and his family on this special day."