Prince Louis stars in stunning christening portraits alongside Prince William, Kate, Prince George and Princess Charlotte

Prince Louis was the centre of attention once again in a series of stunning portraits taken on the day of his christening at St. James's Palace on July 9. British photographer Matt Holyoak immortalized the precious moment in the Morning Room at Clarence House and outside on the grounds, where Prince William and Kate posed for a number of snaps with their children and extended relatives – and the first official photos of the new family of five couldn't be any sweeter!

The fifth-in-line to the throne looked calm as ever in the photos, which shouldn't come as a shock considering the fact that he dozed adorably in his mother's arms as the Cambridges arrived at the Chapel Royal on his baptism day. Duchess Kate was also heard describing her third child as "very relaxed and peaceful," jokingly adding, "I hope he stays this way!" 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.

The Cambridges posed for the first time as a family of five. Photo: © Matt Holyoak/Camera Press

Newlyweds Prince Harry and Meghan appear in two of the snaps, as do Prince Charles and Camilla. The Middleton family - Kate's parents Michael and Carole, brother James and pregnant Pippa with her husband James Matthews - also beam with pride in an extended family portrait. Absent from the portraits are the Queen and Prince Philip, who are believed to have made a joint decision with Prince William and Kate not to attend as they were travelling back from Sandringham ahead of a busy week. Her Majesty, however, looks down on the family from a portrait in the background of the group shots.

GALLERY: All the best photos from Prince Louis' christening

The Duchess of Cambridge was a vision for the third time over in her cream christening ensemble by Alexander McQueen, a v-neck dress with embellished shoulders, which she topped off with an oversized floral-bedecked headband by Jane Taylor. Perfectly coordinated with her baby boy, who wore the family's replica heirloom christening gown made from Honiton lace, the delicate hue is known to signify innocence and new beginnings. The Duke of Cambridge looked dapper in his blue suit and tie.

Kate posed for a precious photo with her third child. Photo: © Matt Holyoak/Camera Press

Princess Charlotte reunited with her baby brother, with whom she'd previously posed for a sweet joint memento marking her third birthday and little Louis' big debut, while Prince George was captured alongside his two-month-old sibling for the first time. The tots looked precious in their blue ensembles – hers a patterned dress with matching Mary-Jane shoes and a Pepa & Co. bow headband, his a white button-down shirt with blue piping and navy shorts by Amaia Kids paired with navy loafers.

RELATED: Did Prince Harry get Prince Louis the cutest christening gift ever?

And it seems Matt was as charmed by the Royal Family as they were by his 2017 portraits of the Queen and Prince Philip, which marked their 70th wedding anniversary. "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," he said. "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." And it's clear to see why the Londoner, who has shot everyone from Ryan Reynolds to Jennifer Lawrence, is one of the world's most renowned portrait photographers.

The family was beaming as they celebrated their new member. Photo: © Matt Holyoak/Camera Press

To celebrate Princess Charlotte's christening in 2015, the Cambridges turned to Mario Testino to take their portraits on the Queen's Sandringham Estate - a mix of casual outdoor family shots and more formal photos with extended family in the property's Drawing Room. Prince George's big day was captured by Jason Bell back in 2013, also in the Morning Room and in a similarly formal style.

The Windsor side of the family, including Prince Harry and Meghan. Photo: © Matt Holyoak/Camera Press

Don't miss a beat with HELLO! Canada's Daily Hits newsletter, your daily dose of royal and celebrity news, fashion, weddings and more. CLICK HERE to sign up for free!