Photographer Matt Holyoak spoke of photographing the family for the special occasion, saying: "I was truly honoured at being asked to take the official photographs at the christening of Prince Louis, and to witness at first hand such a happy event".
Louis, 12 weeks old today, slept through the entire ceremony but here he has opened his eyes as his mother stands in the gardens of Clarence House.
Louis is wearing a replica of the royal christening robe, made of fine Honiton lace lined with white satin, which was created in 1841 for Queen Victoria's eldest daughter, Victoria, the Princess Royal.
The christening photos are the first without the Queen, who missed her great-grandson's baptism, which took place in a private ceremony. Photographer Matt Holyoak took the photos of Prince Louis and his family at Clarence House following the service.
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The Duke and Duchess of Cambridge appointed six godparents for Louis, Kensington Palace revealed on Monday.
Meghan wore an olive green number by Ralph Lauren and matching Stephen Jones hat, while Prince Harry looked dashing and proud in a dark suit as he stood beside his wife.
The Duchess of Cornwall is cheerful in a cream Fiona Clare dress and a Locke hat, while grandfather Prince Charles appears tanned and relaxed.
Two more images have also been released, seen on the next pages.
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Kate's sister, Pippa Middleton and her husband, James Matthews, grandparents Michael Middleton and Carole Middleton, along with the Duchess of Cambridge's brother, James Middleton, were also present for a photograph. George is by now sitting on his father's lap and grinning happily at the camera, presumably at some behind-the-scenes antics.
"Everyone was so relaxed and in such good spirits, it was an absolute pleasure".
"I only hope I have captured some of that joy in my photographs".
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Prince Louis Arthur Charles was born on 23 April 2018 in the Lindo Wing of St Mary's Hospital in London as the third child of the Duke and Duchess of Cambridge.