But Meghan isn't the only royal who's closed her own door before - as many pointed out on Twitter, her sister-in-law, Kate Middleton, has actually done it on several occasions.
Some social media users praised the Duchess for closing the door while others joked she may have cost someone their job. From Meghan's trademark messy bun, to sleek updos and cascading Hollywood waves, we love looking out for the royal's latest hair look.
Meghan Markle attended her first solo engagement as a royal on Tuesday and there was one thing in particular that got everybody talking.
Then, she extended her hand and pushed the door shut before walking away.
"Everyone is freaking out because Meghan Markle closed her own door..." Markle took in a museum exhibit at London's Royal Academy of Arts.
"Current state: Poking my own eyes out after reading Meghan "broke protocol" by shutting her vehicle door".
Etiquette expert William Hanson tweeted: "This is not a protocol breach".
Whether her security is quicker to shut the door for her after this remains to be seen.
Her gesture attracted widespread comment and debate on social media where she was...
As you might imagine, there are a lot of cynics on Twitter enjoying the "woman closes own auto door" spectacle and weighing in with their own amusing takes. Since she married Prince Harry on May 19, the words "break" and "protocol" have been hurled at Meghan countless times, applied to everything from her outfit choices to her hair styling.