Caroline, Princess of Hanover

Caroline, Princess of Hanover (Caroline Louise Marguerite Grimaldi; born 23 January 1957), is the oldest child of Rainier III, Prince of Monaco, and the American actress Grace Kelly. She is the oldest sister of Prince Albert II and Princess Stéphanie. 
Until the births of her niece and nephew, Princess Gabriella and Prince Jacques, in December 2014, was the heir presumptive to the throne of Monaco.
Caroline is married to Ernst August, Prince of Hanover (born 1954).