Prince Harry, 33, a grandson of Queen Elizabeth II and fifth in line to the throne, is engaged to Meghan Markle, 36, his American girlfriend, the royal family said on Monday. The wedding day will be sometime in the spring. Meghan Markle, who is biracial, will be the first non-white person to marry into the royal family in modern history, a fact that sparked debate about interracial marriages in the United Kingdom.