Say hello to Prince Louis Arthur Charles!
This week, the Duke and Duchess of Cambridge have officially welcomed their third child into the world.
Since then the question on everyone's minds has been what the name will be and we finally have an answer.
Tonight Kensington Palace 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."