Charlene Wittstock has not one, but two tough acts to follow. As the future princess of Monaco and wife to longtime bachelor Prince Albert II, the Zimbabwe-born, South Africa-raised former Olympic swimmer is to succeed Grace Kelly, whose 1956 wedding to Prince Rainier III is still widely seen as the gold standard for royal nuptials. And as if the blue-eyed Hollywood beauty-turned-beloved princess didn’t cast a long enough shadow, Albert’s long-awaited marriage to Wittstock comes on the heels of the royal wedding of the decade, Kate Middleton’s union with Britain’s Prince William. It’s still the biggest thing to hit Monaco since...