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MONTE CARLO, MONACO: From left, second row: Mrs Kelly, mother of Princess Grace, Princess Ghislaine, wife of Prince Louis of Monaco, Princess Antoinette, elder sister of Prince Rainier III of Monaco, (first row) Princess Stephanie, Princess Grace, Prince Rainier III and Prince Albert attend a ceremony 10 May 1974 in Monte-Carlo. Prince Albert, born 14 March 1958, is the only son and second child of Prince Rainier III of Monaco and his wife, the former US film star Grace Kelly. Prince Albert is the current Hereditary Prince of Monaco and Marquis des Beaux. His elder sister, Princess Caroline of Monaco, Princess of Hanover, is presently second in line to the throne. AFP PHOTO (Photo credit should read AFP via Getty Images)

MONTE CARLO, MONACO:  From left, second row: Mrs Kelly, mother of Princess Grace, Princess Ghislaine, wife of Prince Louis of Monaco, Princess Antoinette, elder sister of Prince Rainier III of Monaco, (first row) Princess Stephanie, Princess Grace, Prince Rainier III and Prince Albert attend a ceremony 10 May 1974 in Monte-Carlo. Prince Albert, born 14 March 1958, is the only son and second child of Prince Rainier III of Monaco and his wife, the former US film star Grace Kelly. Prince Albert is the current Hereditary Prince of Monaco and Marquis des Beaux. His elder sister, Princess Caroline of Monaco, Princess of Hanover, is presently second in line to the throne. AFP PHOTO (Photo credit should read AFP via Getty Images)