However, his great-grandmother the queen and her husband Prince Philip will not be among the guests, Kensington Palace said.
The newly minted Duke and Duchess of Sussex (AKA Harry and Megan) followed behind the new family of five, along with Louis' proud grandpa, Prince Charles, who walked in with his wife Camilla, Duchess of Cornwall.
Monday marked an important day for Britain's royal family as little Prince Louis was baptised.
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The UK's Press Association said the decision is understood not to have been taken for health reasons and was mutually agreed by the Queen and Louis' parents, the Duke and Duchess of Cambridge, some time ago.
It was also revealed Monday that the Duke and Duchess had chosen two hymns, two lessons and two anthems for the christening.
The Lily Font and water from the River Jordan will be used during the baptism.
The anthems were "This is the day which the Lord hath made" (John Rutter) and "Suo Gan, a traditional Welsh Lullaby" (Gareth Wilson).
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Louis Arthur Charles was born in the private Lindo Wing of St Mary's Hospital in Paddington, London, on 23 April.
See how Prince Louis has grown!
And Louis' non-royal godparents will have influence on the little prince.
The tradition of this particular christening gown harkens back to Queen Victoria, who commissioned the garment for the royal baptism of her daughter Victoria in 1841; you can glimpse one of its earliest representations in a painting of the event from the era.
They include Guy Pelly, once dubbed the "court jester" to William and Harry for his wild ways that were often cited as a bad influence on the brothers in their youth, running their favourite drinking haunts.
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