It's a pose she's struck many times before. In fact, eagle-eyed royal fans may notice that she almost always sits with her legs leaning to one side whenever she's seated at a public event. And, as it turns out, the signature pose likely has to do with etiquette, and it has already earned its own name – the "Duchess slant."
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"Typically 'the Duchess Slant' is used when a lady has to sit for an extended amount of time while keeping poise and posture," Myka Meier, royal etiquette expert and founder and director of Beaumont Etiquette, tells PEOPLE. "It is the perfect pose for when a camera is shooting directly in front of you because by slightly slanting the knees to create a zig-zag effect when wearing a dress or skirt, your legs are angled so that the camera only shoots the sides of your legs and protects your modesty."
Meier also adds that the slant helps make your legs look longer when sitting.
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Of course, Kate isn't the first woman – royal or otherwise – to lean her legs to the side while sitting. Princess Diana would sometimes lean her long legs while posing for seated photos, and even struck that same slant in 1992 while posing on that now famous bench outside the Taj Mahal.
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Turns out, when you're a royal, even the way you sit is carefully orchestrated around etiquette.