This is the second child for the famous couple, who are already parents to two-year-old Leonardo.
While that newborn's name is not yet known, Clarence House tweeted today, "The Duke and Duchess of Cambridge are delighted to announce that they have named their son George Alexander Louis. The baby will be known as His Royal Highness Prince George of Cambridge."
Who shares a birthday with George? Find out here! [SPOILER] Welcome Baby Girl
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