The 27-year-old actress denied the romance on Thursday's episode of "Watch What Happens Live," but said she wasn't bothered by the speculation.
"No, I've met him once in, like, 2013, so it was very random," she said of the reports. "But, I also wasn't, like, in a huge hurry to debunk it!"
Lawrence was linked to Pitt in December following her split from Darren Aronofsky. She said friend and fellow actress Amy Schumer helped cheer her up in the wake of her breakup with the mother! director.
"When Darren and I first broke up, I told [Amy] and I was really sad," the star recounted.
"The next day I get a bouquet of flowers delivered and I was like, 'What is this?'" she said.
"I bring the bouquet of flowers in and there was a note that says, 'I'm so sorry to hear you're gonna die alone. Love, Amy.'"
Lawrence and Aronofsky called it quits in October after a year of dating.
FOLLOW REALITY TV WORLD ON THE ALL-NEW GOOGLE NEWS!
Reality TV World is now available on the all-new Google News app and website. Click here to visit our Google News page, and then click FOLLOW to add us as a news source!
The actress said on Monday's episode of the "WTF with Marc Maron" podcast that she still loves the 49-year-old director.
"I was in love with him for two years," she said. "I still love him very much."
Lawrence will next star in the movie "Red Sparrow," which opens in theaters Friday.
Copyright 2018 United Press International, Inc. (UPI). Any reproduction, republication, redistribution and/or modification of any UPI content is expressly prohibited without UPI's prior written consent.