PRINCE Louis Arthur Charles arrived on April 23, 2018, with mum Kate Middleton giving birth to her third child at the iconic St Mary's Hospital in Paddington, London.
And just like his older siblings, Prince George and Princess Charlotte, baby Cambridge has an impressively long title…
What is the royal baby boy's title?
Understanding royal titles can be tricky because they can hold more than one – especially after they're married.
Kate and Wills’ latest addition holds the formal title: His Royal Highness Prince Louis of the United Kingdom of Great Britain and Northern Ireland.
This is the baby’s official title – but he will have others.
Historian Marlene Koenig told Town & Country that royal children's titles are styled differently if they are also the children of a duke.
This means that because the new prince's parents are the Duke and Duchess of Cambridge, he will also have the title of His Royal Highness Prince Louis of Cambridge.
Kensington Palace confirmed that this is what the royal tot will be known as when they revealed Louis' name on April 27, 2018.
They tweeted: "The Duke and Duchess of Cambridge are delighted to announce that they have named their son Louis Arthur Charles.
"The baby will be known as His Royal Highness Prince Louis of Cambridge."
If the baby had been a girl, her formal title would have been, Her Royal Highness Princess (Name) of the United Kingdom of Great Britain and Northern Ireland.
Why is Prince Louis technically a commoner?
It does get more confusing.
The historian also said that the new royal has technically been born a commoner.
She added: "It sounds complicated, but in the UK, the only people who are not commoners are the Sovereign and peers of the realm, [people with titles like] Duke, Marquess, Earl, Viscount, and Baron.”
This means that up until he married Meghan Markle in May 2018, Prince Harry was technically a commoner too.
Following their marriage, the newlywed couple were bestowed with new titles – the Duke and Duchess of Sussex.
What odds did Sun Bets offer on Prince Louis' name?
Sun Bets had Albert as their final favourite at 4/11.
Meanwhile, Arthur was priced at 5/2, Alexander at 8/1, James at 9/1, Philip at 12/1 and Louis was back at 18/1.
There was speculation that the Royal Family's website had accidentally revealed the baby's name early, but it was all a red herring.
Royal watchers claimed a web page had been reserved for a "Prince Albert" as the world waited for William and Kate to announce the name.
However, web pages are reserved for any previous Royal Family member – this includes the Prince Albert who lived during the 1800s.
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