Kate Middleton, Charlene Wittstock
Credit: Getty Images; StartraksPhoto

Oxblood red was one of the hottest colors on fall runways, and now it’s showing up everywhere—including on our favorite princesses. Catherine, Duchess of Cambridge chose a burgundy Paule Ka suit to meet scholarship recipients in London today, while Princess Charlene of Monaco wore an Akris sheath to the label’s fashion show in Paris last week. What's the appeal? This rich, intense color is as sexy as red yet as versatile and chic as basic black. “This sumptuous shade is flirtatious and even slightly provocative,” color expert Kate Smith of said. “The woman who wears it has an allure that is hard to ignore.” Looking at these royals, we’re inclined to agree!

Plus, see Kate Middleton's best outfits.