"This woman giving it ALL to the selfie cam on the train is SENDING ME," American actor Ben Yahr wrote alongside a video of her "shoot".
Most commuters sitting in the carriage ignore her — expect for the one filming it all of course — either way she's not fazed as she focuses on getting that perfect smouldering selfie.
She goes through various poses with one hand on her hip, legs crossed over as she tilts forward, to squatting as she runs her hands through her long locks.
"Honestly she is my new queen, I worship her and ONLY her!!" another Twitter user commented.
"She's POWERFUL, I want to be her," said another.
"I want to be this unbothered in life," a third commented.
Along with lots of "only in New York" comments, another took it as an opportunity to poke fun: "Let this be a sign that New Yorkers don't give a f** about what you're doing."
Jessica responded to her now viral video, thanking Ben for posting the footage.
"I am overwhelmed by the kind words expressed by everyone and I just want to say THANK YOU to all. Let's spread this positivity and continue to uplift one another … oh and s/o
@benyahr for making my day #NYC #Yerrr."
She also added a couple of photos from her train shoot — a close-up and another a standing pose looking over her shoulder — getting almost 400,000 likes by Monday morning.
Her post has sparked debate on whether she is "confident" or just "shameless".
"I feel weird that I don't read this as confidence when so many others do. Trying to get just the right angle for a selfie doesn't scream confidence to me," one person said.
"I wonder what it's like to be shameless," said another.
But others came to her defence.
"OK slowdown guys there's nothing shameless here," a Subway Bae supporter said.
"To have the confidence to do this in front of others is powerful. I could never," added another.
