While Louis sleeps on his mother's lap as Prince George, Prince William and Princess Charlotte sit alongside, the eye is immediately drawn to Kate's mother, Carole Middleton. "The photographs were taken by Matt Holyoak at Clarence House, following Prince Louis's christening".
Mr Holyoak told BBC News that "everyone was so relaxed and in such good spirits, it was an absolute pleasure".
The third official photo marked the first official family portrait of the Cambridges together since the birth of Prince Louis.
The ex-actress can be seen standing in between Harry and Camilla while beaming widely. I only hope I have captured some of that joy in my photographs, ' Holyoak said in an official statement.
The Windsor side of the family, including Prince Harry and Meghan.
The photographs were taken in the morning room and garden at Clarence House.
Louis was sound asleep as he was carried into the chapel by his mother for the christening ceremony which lasted 40 minutes.
The fifth in line to the British throne, who was born on April 23, was christened by the Archbishop of Canterbury at The Chapel Royal of St James's Palace in central London.
The christening photos are the first without the Queen, who missed her great-grandson's baptism, which took place in a private ceremony.
A fourth image also sees the Cambridge's pose on a ornate chair, while Prince Charles and his wife Camilla stood behind them alongside the Duke and Duchess of Sussex in the back row. Holyoak has worked with a host of celebrities and his photos have regularly been splashed on the covers of magazines such as Harper's Bazaar, Shortlist and Dazed And Confused. The Duke of Cambridge looked dapper in his blue suit and tie.
Ahead of the christening ceremony, Catherine was overheard saying Louis reminded her "so much" of her firstborn, Prince George.