In gorgeous photos taken by Matt Holyoak at Clarence House, the Royal Family is looking especially sharp in neutral toned blues, taupes and creams.
Kate and William were joined by William's father Prince Charles and his wife Camilla, along with younger brother Prince Harry and his wife Meghan, Duchess of Sussex.
On July 9, Prince Louis officially became a part of the Church of England, and his entire family (minus the Queen of England) was there to witness the momentous occasion.
Prince Louis was christened earlier this week and the royal event was the source of much media attention.
Photographer Matt Holyoak captured the special moments at Clarence House after the christening.
Mr Holyoak said: 'Everyone was so relaxed and in such good spirits, it was an absolute pleasure.
Kate posed for a precious photo with her third child.
The fourth and final lovely image shows mother-of-three Kate and her son alone outdoors, as she sweetly cradles Louis.
The 11-week-old prince napped through the 40-minute service in the duchess of Cambridge's arms as she stood alongside her husband, who held the hands of George and Charlotte.
The duchess added, with a smile: "I hope he stays like this". Holyoak has previously worked with the royals in the past and photographed the portraits of Queen Elizabeth II and Prince Philip for their 70th wedding anniversary in 2017.
A week after their youngest son's christening, the royal family have released a series of intimate portraits.