Kate Middleton and Prince William's youngest son Prince Louis celebrates his third birthday today.The youngster was born on April 23 in 2018, at the Lindo Wing in St Mary's hospital in London.And royal fans had to wait four days before the couple announced his name - Louis Arthur Charles.
The name Louis has long been associated with French kings and may have been a tribute to Lord Louis Mountbatten, Prince Philip's uncle.
Louis doesn't have a surname as he has a royal title, and is formally known as His Royal Highness Prince Louis of Cambridge.However, he wasn't technically supposed to have this title - he was only handed it because the Queen stepped in years earlier.
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