She's been taking notes! When Duchess of Sussex Meghan Markle stepped out with husband Prince Harry and Queen Elizabeth for a Buckingham Palace party on Tuesday, June 26, eagle-eyed royal watchers noticed Meghan critique her leg cross to show a perfect demonstration of the "Duchess Slant" at the event. She originally showed it off at her first solo engagement with Queen Elizabeth on Thursday, June 14.

When the Duchess of Sussex first sat down she immediately realized she was doing the slant wrong, so Meghan (without realizing she was on camera, probably), fixed her mistake before onlookers would notice. Watch the clip below!

For those of you who don't know, the "Duchess slant" is a style of sitting where a woman's knees and ankles are kept tightly together and her legs are slanted to the side. According to People, the move was first coined by Beaumont Etiquette and was aptly named after Duchess of Cambridge Kate Middleton, as she's often photographed sitting with her legs in the flattering silhouette. Kate and Meghan's late mother-in-law, Princess Diana, was also a fan of the royals-favorite position.

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Meghan and the Queen on June 14.

"Typically the 'Duchess slant' is used when a lady has to sit for an extended amount of time while keeping poise and posture. 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," Myka Meier, a royal etiquette expert and the founder and director of Beaumont Etiquette, told People.

"'The Duchess slant' is one of the most elegant and flattering ways to sit, because it has a lengthening effect on the legs. The key with the technique is to square your shoulders straight ahead while maintaining perfect posture. Keeping knees and ankles together at all times, position your legs so that you create a slant, angling your knees to the side. Hands should be folded one over the other and placed in your lap," Meier continued.

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Meghan and Kate demonstrating the “Duchess slant.”

According to Meier, a woman crossing her legs at the knees is one of the "biggest etiquette mistakes a lady can make." To instead cross the legs at the ankles is "sophisticated, protects vulnerabilities, and looks fabulous in photos," the expert added.

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