The new Royal Baby was born on April 23, and today, his parents announced who will act as godparents.
The monarch was due to return to London on Monday before a busy schedule of events including a meeting with U.S. President Donald Trump on Friday at her Windsor Castle home.
Princess Charlotte is proving, yet again, that she's nailed the royal wave technique. Kate wore a white McQueen outfit with a headdress by Jane Taylor.
Pippa Middleton arrives with her husband James Matthews.
The anthems were "This is the day which the Lord hath made" (John Rutter) and "Suo Gan, a traditional Welsh Lullaby" (Gareth Wilson).
The details surrounding Prince Louis' christening have been revealed ahead of Monday's ceremony.
He wore the handmade replica of the Royal Christening Robe, which was commissioned by the Queen in order to preserve the original.
Charlotte, who's fourth in line to the throne, is already excelling at being an older sibling.
Louis' big brother and sister Prince George (four) and Princess Charlotte (three) were, as usual, the stars of the show at The Chapel Royal in St James's Palace this afternoon for the celebrations.
What will Prince Louis wear?
One of William's closest friends, James Meade, married Lady Laura Meade, and the couple became increasingly close to both William and Kate over the years. He has been banned from driving three times, including twice for drink-driving and once for speeding.
She's a natural royal and seems to be a lot more confident than her shy older brother, Prince George. His daughter, Florence, was a bridesmaid at the Duke and Duchess of Sussex's royal wedding in May.
While they have not been named, William's private secretary Miguel Head - who leaves the post this month - is the bookies' favourite to be among the godparents.
Hannah Carter, the wife of Robert Carter, is an old friend of Will and Kate's.