Claim: Caroline, Princess of Hanover is married to the heir of George III of the United Kingdom and she is royalty.

Caroline , Princess of Hanover -LRB- Caroline Louise Marguerite ; born 23 January 1957 -RRB- , is the eldest child of Rainier III , Prince of Monaco , and American actress Grace Kelly . She is the elder sister of Prince Albert II and Princess Stéphanie . Until the births of her niece and nephew Princess Gabriella and Prince Jacques of Monaco in December 2014 she had been heir presumptive to the throne of Monaco since 2005 , a position which she previously held from 1957 to 1958 .   Caroline is married to Ernst August , Prince of Hanover -LRB- born 1954 -RRB- , the heir to the former throne of the Kingdom of Hanover , as well as the heir male of George III of the United Kingdom .