Monaco: Princess Caroline and Prince Ernst August of Hanover
Albert's older sister, Princess Caroline of Hanover, has been heir presumptive to the throne of Monaco since 2005. Caroline wed Ernst August, Prince of Hanover, in 1999 while pregnant with their only child together, Princess Alexandra of Hanover (right). Caroline has three older children, Andrea, Charlotte and Pierre, from a former marriage to sportsman heir Stefano Casiraghi. —XFINITY Entertainment Staff (Photos by Getty Images)
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