The Duke and Duchess of Cambridge have had their youngest son, Prince Louis, christened at The Chapel Royal, St. James' Palace.
William and Kate were pictured alongside their newborn son and older children Prince George, four, and Princess Charlotte, three, on Monday afternoon.
It's the first time all five Cambridges have been seen together.
They were joined at the service by William's father, The Prince of Wales, and Camilla, The Duchess of Cornwall, as well as newlyweds The Duke and Duchess of Sussex.
Kate's parents, Carole and Michael Middleton, were also in attendance, alongside her brother James and pregnant sister Pippa, as well as Pippa's husband James Matthews.
Prince Louis wore a handmade replica of the Royal Christening Robe, made by The Queen's dressmaker, Angela Kelly.
The Royal Christening Robe was made in 1841 for the christening of Queen Victoria's eldest daughter, and was worn for all subsequent royal christenings up until James, Viscount Severn, who was born in 2007, who was the first to use the replica robe.
Justin Welby, The Archbishop of Canterbury, was chosen to conduct proceedings, and said earlier: "I’m delighted and privileged to be christening Prince Louis today – a precious child made in God’s image, just as we all are. Please join me in praying for him and his family on this special day."
The ceremony was kept a small affair, with just a handful of friends and relatives in attendance.
The Queen, 92, and her 97-year-old husband Prince Philip are not among the well-wishers, with Buckingham Palace saying it was a decision made "some time ago" and not related to any health issues.
The Queen's had a busy period of engagements recently, and it's believed she's travelling back to London from Norfolk on Monday.
She has another busy week coming up, including President Trump's visit to the UK and the centenary of the RAF.
Prince Philip retired from public duties last year and only occasionally joins The Queen at public events.
The only senior members of the royal family in attendance were The Prince of Wales and The Duchess of Cornwall, and the Duke and Duchess of Sussex.
All six of Louis' godparents and their spouses were, obviously, invited.
The godparents are:
Miss Lucy Middleton, Kate's cousin
Mr Nicholas van Cutsem, William's childhood friend; his brother, William, is godparent to Prince George.
Mr Harry Aubrey-Fletcher, the couple's close friend
The Lady Laura Meade, the couple's close friend; her husband, James Meade, went to school with William, was an usher at the Cambridges' wedding and is godparent to Princess Charlotte.
Mrs Robert Carter, the couple's close friend; she went to school with Kate and her sister-in-law, Sophie, is godparent to Princess Charlotte.
Mr Guy Pelly, William's close friend
Some royal fans had expected to see Meghan, the Duchess of Sussex among the godparents, after she married William's younger brother, Prince Harry, in May, but she has not been included among the six.
However, Harry is not a godparent to any of William and Kate's children, either.
Prince George has seven godparents, while Princess Charlotte has five.
He has not been seen in public since William and Kate left the hospital with him, so there has been considerable excitement at seeing him again.
Water from the River Jordan was used during the baptism at The Lily Font.
Prince George was also christened at The Chapel Royal, St. James' Palace, while Charlotte was christened at the Church of St Mary Magdalene at Sandringham.
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The Duke and Duchess of Cambridge hosted a private tea party at Clarence House following the christening, where guests were treated to christening cake made from a tier of the couple's wedding cake.
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