Meghan and Harry have not been appointed as Prince Louis godparents, despite public speculations that the couple would be chosen by the Duke and Duchess of Cambridge.
The princess's friend Julia Samuel was made George's godmother, while Diana's niece Laura Fellowes is one of Charlotte's.
Eleven-week-old Prince Louis is scheduled to attend his first ever royal event Monday afternoon: His christening Monday in the Chapel Royal at St. James's Palace.
When Prince Louis is baptised on Monday at the Chapel Royal, the Duke and Duchess of Cambridge are expected to keep to convention.
Europe Correspondent Joy Reid looks at the history behind the Prince Louis' name.
Louis wore wearing a silk and lace christening gown made in 2008, a handmade replica of the Royal Christening Robe.
George, who is almost five, is expected to join his family for the 40-minute church service, but royal nanny Maria Teresa Turrion Borrallo could be on hand in her traditional Norland uniform to look after her charges.
The baptism is to be conducted by the Archbishop of Canterbury, the Most Reverend Justin Welby.
One royal that will be noticeably absent from the festivities is Prince Charles' brother Prince Andrew, who, according to Express, will not attend as he is scheduled to visit the University of Huddersfield.
Guy Pelly is a British nightclub owner and entrepreneur who has been friends with Will and Harry for years.
Princess Charlotte, however, was christened at the Church of St Mary Magdalene at Sandringham in Norfolk. The Lily Font is a silver baptismal font which was made in 1840 and has been a fixture at royal christenings since then. The christening cake served at the tea is a tier taken from William and Kate's eight-tier wedding cake.