Getty/Chris Jackson The Duke and Duchess of Cambridge have announced the name of their third child: Louis Arthur Charles. The royal baby was born on Monday morning in the Lindo Wing of St. Mary's Hospital in London. The baby is fifth in line to the throne, bumping Prince Harry to sixth place. The couple took time to show off their newborn royal to photographers waiting outside the hospital as they made their exit later on Monday before heading back to Kensington Palace.