Arriving for her first solo engagement at the Royal Academy of Arts last night, Meghan, 37, nearly managed to upstage herself - simply by not waiting for someone to close the door after she alighted from her vehicle. "We had better get out before we have a drugs test!"
During the tour of the exhibition, Markle viewed art from New Zealand, Fiji, the Kingdom of Tonga and, of course, Australia.
She then shook hands with one of her hosts before shutting the auto door behind her. While Markle's frock is much more demure than Diana's gorgeous cocktail dress, it's hard to think of Princess Diana any time you see one of the female members of the royal family wearing the color.
Markle's door-closing went viral within hours, with footage of the moment circulating on Twitter.
Another tweeted: " She closes her own door.
"Breaking News: Meghan Markle shut her vehicle door all by her little ole self yesterday", tweeted one sarcastic observer.
Ah, yes - everyone loves a royal rebel ignoring the rule book.
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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.
She knows how to shut a auto door all by herself. "Vehicle door shutting does not fall under protocol!"
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.
First time I've seen an on-duty princess shut her own auto door...
In one recent rant, Samantha referred to her half-sister as a "ducha**" and claimed that if their father passed away it would be because of her. She closes a door - all by herself - we are so impressed we could die.
While news of a woman closing a door in 2018 does not usually ignite global debate, Markle's gesture caused quite the stir on social media.