While strolling through the Big Apple following dinner at O YA restaurant, the two couldn't keep their hands off each other, packing on the PDA as photographers snapped their pics.
At one point, Lawrence even shared a steamy kiss with the 47-year-old Black Swan director.
An eyewitness tell ET that after dinner "they strolled around and Darren was pointing out different buildings and things, showing Jennifer around the city."
"Lawrence looked to be into the stuff he was saying," the eyewitness added. "Darren was animated and happy, pointing, holding hands with Jennifer, and kissing her. She looked really happy, not fake -- they were into each other."
Around midnight, Aronofsky hailed a car for Lawrence as he walked home. According to the eyewitness, the two spent approximately three hours together.
Lawrence and Aronofsky met over the summer when they collaborated on a still-untitled project. While they have yet to confirm whether they're officially a couple, it's clear these two are more than just friends.
While speaking with Glamour earlier this year, the Oscar winner admitted she finds it difficult to meet men she wants to date. "I'll find a guy attractive maybe once a year," she explained. "But I'm not a lonely person. Me not dating someone is not a lack of anything in any way. I feel completely fulfilled."
"When I spark with someone, it's exciting," she continued. "But I definitely don't need that."
Back in May, ET caught up with Lawrence at a press junket for X-Men: Apocalypse, where she revealed a hilarious story about her ex-boyfriend, Nicholas Hoult.
"Nick always said whenever I yelled at him it was always in a Southern accent," the Louisville, Kentucky, native shared. "I find if I get angry, drunk, or really excited I get more Scottish."