The name of the newborn baby boy in Britain's royal family was released Friday: Louis Arthur Charles. The name was revealed by Kensington Palace four days after his birth, and he's been bestowed the title His Royal Highness Prince Louis of Cambridge. The Duchess of Cambridge, better known as Kate Middleton, delivered the baby weighing 8 pounds 7 ounces in London on Monday. Prince Louis is the third child for Kate and Prince William, and fifth in line to the throne.