Prince William and Duchess Kate of Cambridge released the official photograph of the christening of their third child, baby Prince Louis, on Sunday amidst a chorus of cooing from royal fans.

DO NOT PUBLISH AFTER JULY 28, 2018
HANDOUT PHOTO THE CHRISTENING OF PRINCE LOUIS THE OFFICIAL PHOTOGRAPHS The Duchess of Cambridge and Prince Louis. The Duke and Duchess of Cambridge have released four official photographs to mark the christening of Prince Louis on Monday 9th July. The photographs were taken by Matt Holyoak in the Morning Room and the garden at Clarence House, following Prince Louis's baptism in The Chapel Royal, St. JamesÕs Palace. Mandatory credit: Matt Holyoak/Camera Press
Matt Holyoak, Camera Press

All babies are cute, the saying goes, but royal babies are especially adorable, even in the context of official, for-the-history-books photographs.

Noted portrait photographer Matt Holyoak clicked the shutter on the four portraits, which show the baby, born April 23, in the royal lace christening gown (a replica of the 1841 original worn by Queen Victoria's eldest daughter) and surrounded by both his families, Windsor and Middleton. 

The photos were taken July 9 in the Morning Room and garden of Clarence House.

DO NOT PUBLISH AFTER JULY 28, 2018
HANDOUT PHOTO THE CHRISTENING OF PRINCE LOUIS THE OFFICIAL PHOTOGRAPHS Seated (left to right): Prince George, The Duke of Cambridge, Prince Louis, The Duchess of Cambridge, Princess Charlotte. Standing (left to right): The Duke of Sussex, The Duchess of Sussex, The Duchess of Cornwall, The Prince of Wales, Mrs. Carole Middleton, Mr. Michael Middleton, Mrs. Pippa Matthews, Mr. James Matthews, Mr. James Middleton. The Duke and Duchess of Cambridge have released four official photographs to mark the christening of Prince Louis on Monday 9th July. The photographs were taken by Matt Holyoak in the Morning Room and the garden at Clarence House, following Prince Louis's baptism in The Chapel Royal, St. JamesÕs Palace. Mandatory credit: Matt Holyoak/Camera Press
Matt Holyoak, Camera Press

The baby is fifth in line to the throne.

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DO NOT PUBLISH AFTER JULY 28, 2018
HANDOUT PHOTO THE CHRISTENING OF PRINCE LOUIS THE OFFICIAL PHOTOGRAPHS The Duke and Duchess of Cambridge, Prince George, Princess Charlotte and Prince Louis. The Duke and Duchess of Cambridge have released four official photographs to mark the christening of Prince Louis on Monday 9th July. The photographs were taken by Matt Holyoak in the Morning Room and the garden at Clarence House, following Prince Louis's baptism in The Chapel Royal, St. JamesÕs Palace. Mandatory credit: Matt Holyoak/Camera Press
Matt Holyoak, Camera Press

Pictured are the baby's parents and his siblings, Prince George, 4, and Princess Charlotte, 3, and both sets of grandparents, Prince Charles and his wife, Duchess Camilla of Cornwall, and Carole and Michael Middleton.

Also there: His uncle Prince Harry and his wife, Duchess Meghan of Sussex, his aunt Pippa Middleton Matthews and her husband, James Matthews, and his uncle James Middleton. 

Missing: His great-grandparents, Queen Elizabeth II and Prince Philip. The prince, 97, has retired from public life and the queen was traveling after a busy week in Scotland.

Also in attendance on July 9 were the six godparents named just hours before the christening in the Chapel Royal at St. James's Palace in London.

DO NOT PUBLISH AFTER JULY 28, 2018
HANDOUT PHOTO THE CHRISTENING OF PRINCE LOUIS THE OFFICIAL PHOTOGRAPHS Seated (left to right): The Duke of Cambridge, Prince George, Prince Louis, The Duchess of Cambridge, Princess Charlotte. Standing (left to right): The Duchess of Cornwall, The Prince of Wales, The Duke of Sussex, The Duchess of Sussex. The Duke and Duchess of Cambridge have released four official photographs to mark the christening of Prince Louis on Monday 9th July. The photographs were taken by Matt Holyoak in the Morning Room and the garden at Clarence House, following Prince Louis's baptism in The Chapel Royal, St. JamesÕs Palace. Mandatory credit: Matt Holyoak/Camera Press
Matt Holyoak, Camera Press

Nicholas van Cutsem, one of William and Harry's oldest friends; Guy Pelly, another longtime chum who married an American in Memphis in a 2014 wedding attended by William and Harry; Harry Aubrey-Fletcher, another old friend of William's; Lady Laura Meade, the daughter of an earl who married one of William's closest friends from Eton, James Meade, who is a godparent to Princess Charlotte; Hannah Carter, an old school friend of Kate's and sister-in-law to one of Princess Charlotte's godparents; and Lucy Middleton, Kate's cousin, whose brother, Adam Middleton, is a godparent to Princess Charlotte.

The gown worn by Louis in the photos is a near-exact replica of the garment that was first worn by Princess Victoria. Inspired by the design of Queen Victoria's wedding dress and believed to have been made of the same silk and lace, the garment was worn by 62 royal babies at their christenings over the next 163 years, including Prince Charles, Prince William, and Prince Harry.

After the christening of Lady Louise Windsor in 2004, the original gown was deemed too fragile, and in 2008, Queen Elizabeth II's dresser, Angela Kelly, and Buckingham Palace's team of dressmakers created a new garment for future royal christenings.

The first baby to wear the new gown was James, Lady Louise's younger brother, in 2008. Since then, it's been worn by Louis' siblings, Prince George and Princess Charlotte, as well as other royal offspring. 

AP BRITAIN ROYALS CHRISTENING I ENT GBR
Duchess Kate smiles as she holds Prince Louis in a photo taken following his christening.
Matt Porteous/AP

Early Monday morning, Kensington Palace released an additional photo snapped after Louis' christening. In the image taken by photographer Matt Porteous, the young prince's face is illuminated by a smile, mirroring his mother's.