Royal fans and fashion followers are familiar with Princess Diana's nieces Kitty, Eliza and Amelia Spencer, with the glamorous trio being a regular fixture on the British society scene. While Kitty and crew frequently make appearances on social media (and in this magazine), they have a lesser-known sibling who stays out of the spotlight—and it turns out their brother Louis Spencer will one day inherit a massive fortune.
As Viscount Althorp, Louis—who is celebrating his 31st birthday on Friday, March 14—is the eldest son of Princess Diana's brother Charles, Earl Spencer and therefore heir to the Spencer dynasty. Even though he has three older sisters, the custom of male primogeniture means Kitty, Amelia and Eliza have been cut out of inheriting the family estate.
