The new prince was born exactly a week ago, after Kate was admitted to hospital early Monday morning, and his name was finally announced on Friday, after a week of speculation as to what moniker the Cambridges would pick for their third child.
A statement released by Kensington Palace read: "The Duke and Duchess of Cambridge are delighted to announce that they have named their son Louis Arthur Charles". And for "name and surname", all three royals are listed under their full royal titles.
Kensington Palace toasted the landmark date by tweeting a cute photograph of William and Kate together on their special day to it's 1.3million followers.
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Well some eagled-eyed royalists have gone back to Prince William and Kate Middleton's wedding day back in 2011 and pointed out how Kate pronounces her husband's middle name during their vows. As in the past, the Duchess had a quick labour and Prince Louis was born at 11.01 at 8lbs 7oz.
She said: 'I was so pleased when I heard he was Prince Louis but a bit surprised because I didn't think the name was the top runner'.
The young princess began nursery, starting at Willcocks Nursery School close to her Kensington Palace home. "The baby will be known as His Royal Highness Prince Louis of Cambridge".
Of course, with an elder brother in Prince George, the chances of either of the younger Cambridge children inheriting the throne now occupied by their great-grandmother are remote.
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Louis Tomlinson has offered to take the new royal baby under his wing after he was named Prince Arthur Louis Charles.
Kate Middleton, 36, and Prince William, 35, welcomed Prince Louis into the world on April 23.
The Prince of Wales, who grew up without grandfathers, referred to Lord Mountbatten as his honorary grandfather so the name will surely please him.
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