From Mariah Carey's record-breaking diamond to Grace Kelly's timeless Cartier classic, a look at the most expensive celebrity ...

Prince Rainier III of Monaco and Grace Kelly, Hollywood's "queen" of the big screen. (Getty Images) According to Albert, Rainier invited Kelly to see his 225-room palace.

When Old Hollywood legend Grace Kelly married Prince Rainier III of Monaco back in 1956, a new, unbelievably high standard ...

Grace Kelly had 3 children with her husband, Prince Rainier III. Here’s what the Monégasque royals are up to now.

Grace Kelly left behind Hollywood fame to become a princess when she married Prince Rainier III of Monaco – but life wasn’t always a fairytale. The Alfred Hitchcock blonde and Oscar winner ...

Unless you are actress Grace Kelly in the 1950s. Everyone knows that story: the Hollywood actress met a prince and fell in love. But there’s so much more to the romantic tale than most people know.

Princess Grace Kelly was an adored figure in Monaco Grace Kelly | Herbert Dorfman/Corbis via Getty Images When Kelly married Prince Rainier III in 1956, she was a complete outsider to the royal scene.

Princess Grace Kelly waves to cheering crowds lining the road as she rides in an open car with Prince Rainier III following their wedding on April 19, 1956. AP file ...

Grace Kelly and Prince Rainier are seated in the Throne room of the Prince's Palace in Monaco, where they were married in a civil ceremony on April 18, 1956. Their Cathedral wedding is April 19.

When they first met, Grace Kelly was an Oscar-winning actress and Prince Rainier was . . . a prince. And though their relationship may have been more high-profile than most, their courtship had ...

When she married Prince Rainier in 1956 at the age of 26, Grace Kelly would become Princess Grace of Monaco, dedicating the remainder of her life to her children, charity work and her royal duties.

This week marked 40 years since the death of American actress — and Princess of Monaco — Grace Kelly. The Prince's Palace honored the beloved figure on Wednesday.