It was also revealed Monday that the Duke and Duchess had chosen two hymns, two lessons and two anthems for the christening.
Louis will have six godparents, including close friends and family members of the royal couple.
Prince Louis was born on April 23, 2018, and on July 9, he was christened for the world to see.
Justin Welby, the Archbishop of Canterbury, officiated Prince Louis' christening.
According to Kensington Palace, Prince Louis wore a handmade replica of the Royal Christening Robe, which was made in 1841 and was used for christening Queen Victoria's eldest daughter. The little prince wore the same gown his older siblings wore to their christenings and continued the tradition. The duchess wore a Ralph Lauren dress, a Stephen Jones hat, Manolo Blahnik shoes, as well as gloves and a clutch.
At the christening of William's children, there has usually been a poignant nod to the duke's late mother Diana, Princess of Wales, who was killed in a auto crash in 1997.
"This new version was commissioned by The Queen and made by Angela Kelly and her team as a copy of the famous original which was deemed too fragile to remain in use".
While attending Prince Louis' christening, big sister Princess Charlotte gave photographers a sassy message and a stare-down.
It will be the first time the Duke and Duchess of Cambridge and their three children have been seen together.