Holyoak said: "I was truly honoured at being asked to take the official photographs at the christening of Prince Louis, and to witness first hand such a happy event".
The Royal Family has released several official photos to mark Prince Louis' christening last week at a royal chapel.
Louis was christened in the Chapel Royal at St James's Palace on 9 July with the Royal Family, Middleton family and his godparents and their spouses in attendance.
In another, the royals are joined by Catherine's parents, Carole and Michael Middleton, sister Pippa Matthews and her husband James, and brother James Middleton.
As the family left, Prince Johann Ernst von Sachsen-Weimar's Concerto in G major, BWV 592 was performed.
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The Cambridges are now a family of five.
Princess Charlotte couldn't keep her eyes off her little brother as she posed for the photo with just royal family members.
Queen Elizabeth II and Prince Philip are notably absent from the group photos as they were unable to attend their new great-grandson's christening. The archbishop of Canterbury, the Most Rev. Justin Welby, who also officiated the May nuptials of Prince Harry and Meghan, Duchess of Sussex, performed the ceremony.
On the sofa, William has a protective arm around George - who will be five next Sunday - while cheeky Charlotte stares challengingly at the camera as if plotting her next piece of mischief.
The duchess added, with a smile: "I hope he stays like this". The sweetest of the portraits puts Kate and Louis' special bond on full display as she gazes down adoringly at her third child in the only outdoor shot.