"I'm delighted and privileged to be christening Prince Louis today - a precious child made in God's image, just as we all are", Archbishop of Canterbury Justin Welby said on Twitter.
The christening marked Louis' second public appearance since his birth in April.
Prince Louis was christened with water from River Jordan, which was flown in especially for the event.
It was a family affair for the Middletons, who all stepped out on Monday afternoon to celebrate Prince Louis' christening.
Prince Harry bought a very special (and expensive) christening gift for Prince Louis, who is due to be christened today.
Buckingham Palace say the Queen and Duke of Edinburgh will miss the christening in a decision which was mutually agreed by the Queen and the Cambridges some time ago.
Louis's siblings, Prince George, 4, and Princess Charlotte, 3, also watched the ceremony at the Chapel Royal in St. James's Palace.
The Queen and Prince Philip won't attend the christening. He was baptized at the Chapel Royal on the grounds of St James's Palace in London, just like his older brother George.
"She loved all the old classics and Harry had the brilliant idea of starting a little library of first editions for Louis, Charlotte and George to enjoy as they get older".
The baby wore a handmade replica of the Royal Christening Robe, which was made in 1841 for the christening of Queen Victoria's eldest daughter, according to Kensington Palace.
Prince Charles and his wife, Camillia, will be present amongst guests, along with the Duke and Duchess of Sussex.
Queen Victoria and Prince Albert Wednesday in the chapel, and the heart of Queen Mary is buried inside. Prince Louis's six godparents include a number of Will and Kate's close friends: Nicholas van Cutsem, Guy Pelly, Harry Aubrey-Fletcher, Lady Laura Meade, Mrs. Robert Carter (a.k.a. Hannah Gillingham), and Lucy Middleton.
Kate, dressed in an ivory dress and matching hat, and William were joined by William's father Prince Charles and his wife Camilla, along with younger brother Prince Harry and his wife Meghan, dressed in olive green.
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