It's no accident that the Duchess of Cambridge takes perfect pictures — Kate Middleton has her go-to poses down to a science. In fact, any royal enthusiast will know that Kate always sits exactly the same way whenever the cameras start snapping: knees and ankles together (not crossed!) and her legs tilted to one side.

Just check out the evidence:

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The royal's signature position has even earned its own nickname among etiquette experts. '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, founder and director of Beaumont Etiquette, told People. 'It is the perfect pose for when a camera is shooting directly in front of you because by slightly slanting the knees ... your legs are angled so that the camera only shoots the sides of your legs and protects your modesty.'

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Etiquette expert Grant Harold, a former butler to Prince Charles, agrees: 'When wearing high heels this positioning can of course be more comfortable and more importantly stops you from tripping someone up,' he told the Daily Mail. 'Ladies wouldn't normally cross their legs and certainly would not cross them at the knees.'

But while it may carry her title, Kate didn't invent the pose — Princess Diana used the exact same technique:

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It's safe to say the Duchess' mother-in-law would be very proud of her royal composure.

(Via House Beautiful)

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