There for the opening of a new solo exhibition, she composes herself, then steps out of the vehicle dressed in Givenchy to greet her host (a museum employee, we're guessing) and the zillions of event photogs with cameras all on her.
A new royal documentary that features Meghan, 37, had viewers questioning if she was already losing her American accent.
Footage of the moment quickly appeared on Twitter, and the reaction from some was nothing short of hysterical.
"Meghan's developed a case of Madonna's accent change", tweeted one viewer.
Meghan has been breaking protocol since she married Prince Harry and every time she does it, it sends social media into a spin.
Ah, yes - everyone loves a royal rebel ignoring the rule book.
The entire debate has now sparked some hilarious responses from other social media users, with Radio 1 presenter Nick Grimshaw leading them as he wrote: "In a twist to today's Meghan-Shuts-Her-Own-Car-Door news, I just had to have someone open the auto door for me in a Cardiff carpark as the childlock was on".
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Google Images was redesigned to weave in " Lens " technology that enables queries based on what is pointed out in pictures. This story's main image shows what milestones Google has achieved and what Kiwis have searched for over the last 20 years.
The Duchess stepped out of her auto and greeted a member of staff, before shutting her own vehicle door. "It is something she's always done herself like the rest of us".
The Duke and Duchess of Sussex will head to the coast to visit the city of Brighton and Hove in East Sussex for a special away day on Wednesday October 3.
"Current state: Poking my own eyes out after reading Meghan "broke protocol" by shutting her vehicle door".
"Usually, if you are a member of the royal family or a dignitary, you have a member of staff to open and close a auto door for you", etiquette expert William Hanson said in an interview with Radio 1 Newsbeat via the BBC.
WATCH: Here's what Meghan got up to on her first solo royal outing after closing that auto door.
First time I've seen an on-duty princess shut her own auto door...
Not everyone was quite so taken with Meghan's door-closing gesture.