Queen Elizabeth II and her husband Prince Philip didn't attend.
Like his siblings Prince George and Princess Charlotte before him, Louis will be dressed up in an article of clothing that carries the weight of history.
The decision is understood not to have been taken on health grounds, and to have been mutually agreed by the Queen and the Cambridges some time ago.
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Louis will wear the handmade replica of the Royal Christening Robe, which in 2008 replaced the original which had been worn for all royal christenings since that of Queen Victoria's eldest daughter in 1841.
Expected to be in attendance at the christening are Prince Charles and Duchess Camilla, Duchess Meghan Markle and Prince Harry, the Middleton family, and all of the godparents and their spouses. Meghan Markle, the Duchess of Sussex, wore an army green Ralph Lauren dress and hat by Stephen Jones.
The royal couple also named six close friends and family members to be godparents to Prince Louis, who was born in April.
The Prince of Wales and Duchess of Cornwall - William's father and stepmother - will attend the ceremony, as will Catherine's parents, siblings and brother-in-law, according to Kensington Palace.
For her daughter Charlotte's christening on July 5, 2015, Kate wore a attractive white coat by Alexander McQueen and a white fascinator by Jane Taylor - a similar look by the same designers.