Meghan, 37, who is officially known as the Duchess of Sussex, visited the Royal Academy of Arts, where on display are some 200 works including ornaments, canoes and images from the Pacific region Meghan will visit with Harry on their first overseas tour next month.
Meghan Markle closes her own car's door.
Then, she extended her hand and pushed the door shut before walking away.
But what really got everyone talking was a perceived breach of royal protocol.
While there are undoubtedly guidelines royals are expected to adhere to in public - refraining from voicing their political opinions, for instance - it seems the royal-adoring public is, well, inventing a lot of them.
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In proof that literally anything she does can (and will) be turned into a headline, Meghan Markle has sparked a tizzy among royal watchers by. closing a vehicle door. "Well done Meghan!" The Sun's royal corresponded Emily Andrews tweeted.
Whether her security is quicker to shut the door for her after this remains to be seen.
Despite most people assuming door shutting just wasn't something royals were supposed to do, etiquette and protocol coach William Hanson insisted there were actually no rules in place.
When Meghan and Harry first stepped out in public after their engagement, Meghan had to gently turn down a selfie request from a fan.
Her gesture attracted widespread comment and debate on social media where she was... "It is something she's always done herself like the rest of us".