Elsewhere, Sophie Carter - who already acts as a godmother for three-year-old Princess Charlotte - is among the list, and so is Lucy Middleton, a cousin of the Duchess.
However, other prominent members of the royal family will be at the baptism, including the Prince of Wales and the Duchess of Cornwall, as well as the Duke and Duchess of Sussex.
George, four, and three-year-old Charlotte held William's hand, as a sleeping Louis was carried into the chapel by Kate.
While Louis has six godparents, future king Prince George has seven and Princess Charlotte has five.
Like George in 2013, Louis wore his wearing his finery to the Chapel Royal at St. James Palace; and like with both George and Charlotte, the Archbishop of Canterbury Justin Welby will be performing the christening honors.
As for the godfathers, Nicholas van Cutsem is a childhood friend of Prince William and brother of William van Cutsem, who is one of Prince George's godfathers.
Next is Guy Pelly, whose mother was friends with the late Princess Diana.
Metro UK reports that Meghan and Pippa Middleton will attend the 40-minute service, which is reserved for close family and friends.
The young prince is set to wear a replica of the royal christening robe, a white lace, satin-lined dress first worn in 1841 and now reproduced by dressmaker to the Queen Angela Kelly.
According to tradition, the water used for Louis's christening will be holy water from the River Jordan, where it is said Jesus was baptised by John the Baptist.
At his christening on October 23, 2013 at the Chapel Royal at St. James's Palace in London, Prince George was dressed up in the newly made replica of the classic Victorian christening gown. The christening cake served at the tea is a tier taken from William and Kate's eight-tier wedding cake.
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