Britain's Prince William and Kate, Duchess of Cambridge wave as they hold their newborn baby son as they leave the Lindo wing at St Mary's Hospital in London London, Monday, April 23, 2018.

Kensington Palace announced Friday that Will and Kate's third royal baby has been named Louis Arthur Charles. The celebratory tweet helpfully noted that his official title will be His Royal Highness Prince Louis...

Photo Credit: Tim Ireland/AP