The Oscar-winning actress, 27, and the acclaimed 48-year-old filmmaker arrived hand-in-hand at the screening of Mother!, after it received mixed reviews.
Having stayed tight-lipped about their romance all year, the couple finally posed for pictures together on the red carpet on Wednesday night having kept their distance at the Toronto Film Festival.
The pair met on set of the new psychological thriller last year, and have reportedly been dating ever since.
Speaking about his leading lady earlier this week, Aronofsky said: “I don't know what makes her great - maybe it was her parents, maybe it was the Kentucky water.”
“I have no idea, but she's, like, a once-in-a-generation talent, and just a whirlwind and a hurricane and an earthquake and a thunderstorm of talent.”
The Black Swan director’s dark new film has received mixed reviews, with most critics hailing it a masterpiece.
“It's not like we didn't know when we were making this movie. It's an assault. [Aronofsky is] poking people in the eyes,” Lawrence told Digital Spy.
“We knew that it's a movie you're either going to get and love it, or you're going to absolutely hate it.”