Louis is the third child of the Duke and Duchess of Cambridge and is fifth in the line of succession to the British throne after his grandfather Prince Charles, his father William and his siblings Prince George and Princess Charlotte.
Each godparent is a close friend or family member of Louis' parents, Prince William and Kate, the Duke and Duchess of Cambridge.
Prince Louis' six godparents are all friends and family of Prince William and Middleton: Nicholas van Cutsem, Guy Pelly, Harry Aubrey-Fletcher, Lady Laura Meade, Mrs. Robert Carter and Lucy Middleton.
Experts point to Prince Louis' christening ceremony earlier this week that perfectly balanced the need for the family's privacy, whilst allowing royal watchers the chance to celebrate Prince Louis - which they say was all Kate's doing.
And while there's no royal rule on the colour she should wear, Kate has opted to wear neutral white or cream at all of them.
It is a replica of a 19th century one used for most of Queen Victoria's children which is now too delicate to wear.
The Palace also announced that the Prince of Wales and the Duchess of Cornwall, and the Duke and Duchess of Sussex would all be in attendance.
A photo shared by People showed Charlotte poking out her tongue while George could be seen next to her with his mouth agape.
The family the made the short trip back to Buckingham Palace for a military ceremony followed by a flypast, which the royals viewed from the balcony of the palace. The Duchess of Cambridge was carrying Prince Louis in her arms.
The royal couple's youngest son was christened at the Chapel Royal at St. James's Palace - the same church where his brother Prince George was christened.
Princess Charlotte wore a blue, flowered dress, while brother Prince George, who turns five later this month, was outfitted in a white shirt and blue shorts.