The Personal Shopper actress and Cannes jury member stepped out at the French film event to attend the premiere of BlacKkKlansman, the new movie directed by Spike Lee which stars John David Washington and Adam Driver.
As the cooler, slightly more hip, younger sibling to the Academy Awards, the Cannes Film Festival is now captivating the film and fashion world.
Yes, it's widely known that the festival requires women to wear high heels on the red carpet, and even turned some attendees away in 2015 after they rocked up in flats.
Well, this year Kristen put her money where her mouth is and literally kicked off her heels in front of the world's media.
As such, exactly 82 women demonstrated at this year's festival in protest. Kristen has been previously vocal about the dress code.
Stewart doubled down on her previous comments during a roundtable discussion a year ago. "If you're not asking guys to wear heels and a dress, you can not ask me either".
Within no time netizens and millennials began lauding Kristen for her bold move to put an end to the unnecessary rules.
"I feel like you can't ask people that any more - it's a given".
"It has become really obvious that if [a man and I] were walking the red carpet together and someone stopped me and said, 'Excuse me, young lady, you're not wearing heels". "It can work both ways. I get the black-tie thing, but you should be able to do either version - flats or heels", she said.