Caroline, Princess of Hanover is married to a male heir and she is royalty.
Caroline , Princess of Hanover ( Caroline Louise Marguerite ; born 23 January 1957 ) , is the eldest child of Rainier III , Prince of Monaco , and American actress Grace Kelly . Caroline is married to Ernst August , Prince of Hanover ( born 1954 ) , the heir to the former throne of the Kingdom of Hanover , as well as the heir male of George III of the United Kingdom .