Prince William and Kate Middleton pictured for the first time with their three children in official christening portraits

Prince William and Kate's youngest son was baptised on Monday 9 July

The first official pictures of the Duke and Duchess of Cambridge as a family of five have been released by Kensington Palace. The breathtakingly beautiful portraits mark the christening of Prince Louis, which took place on Monday afternoon at St James's Palace in London. In one of the photographs, taken by royal photographer Matt Holyoak in the Morning room at Clarence House, the young Prince is pictured with his mother and father, Prince William and Kate, as well as big brother Prince George and sister Princess Charlotte. Mr Holyoak, who photographed the Queen and Prince Philip last year on their 70th wedding anniversary, took the four official photographs at Prince Charles' official residence.

The family portrait sees the proud parents with their children and Kate's parents, Michael and Carole Middleton. Other guests include Pippa Middleton and her husband James Matthews, James Middleton, the Prince of Wales, the Duchess of Cornwall and newlyweds Prince Harry and Meghan Markle - a portrait of the Queen also makes an appearance. In another photograph taken in the garden, doting mother Kate can be seen sharing a sweet moment with little Louis. Holding her son up close to her chest, it's clear for the world to see how enamoured the royal is with her newborn baby.

Photographer Matt Holyoak said of being chosen for the special day: "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. 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."

READ: Why Kate Middleton always wears cream at her children's christenings

The tiny Prince looked simply adorable in a cream gown which many royal babies before him have worn. The robe, which was created by the Queen's dresser Angela Kelly, is a replica of the intricate lace and satin dress made for Queen Victoria's eldest daughter in 1841. The special occasion was Louis' first public appearance since he made his debut on the steps of the Lindo Wing in April, and it marked the Cambridge family's first outing as a family of five.

WATCH: How Prince Louis' christening compared with Prince George and Princess Charlotte's big days

Louis, who is fifth-in-line to the throne, was christened at the Chapel Royal of St James's Palace - the same venue where Prince George was also welcomed into the Christian faith in October 2013. Most recently, Prince Harry's wife Meghan Markle was baptised at the chapel in March, two months before her wedding. The Archbishop of Canterbury, the Most Reverend Justin Welby, conducted the service earlier this week.

MORE: See how Prince Louis has grown! His best christening photos from all angles

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