He was baptized at the Chapel Royal on the grounds of St James's Palace in London, just like his older brother George.
Instead, the Duke and Duchess of Cambridge chose close friends and extended family members to be Louis' godparents.
What's the history behind the gown that was used since 1841?
The Queen and Prince Philip did not attend. At affair, the 34-year-old socialite donned a gorgeous baby blue dress to her nephew's outing that cut a similar style to the Alexander McQueen number her 36-year-old royal sis wore to her 2017 wedding.
He wore the handmade replica of the Royal Christening Robe, which was commissioned by the Queen in order to preserve the original. She definitely didn't upstage the bride with that recycled fashion choice, but she still looked awesome. The new version was made by the Queen's dresser, Angela Kelly. But ultimately time got the best of it.