The Hunger Games star appeared on the BBC's The Graham Norton Show Friday and unloaded on the GOP frontrunner.
Norton asked the Oscar winner if she has ever met Trump, she replied: “I haven't, no. I was at a concert he was attending… I was adamant on finding him and making a video of me going, 'Hey Trump! F*** you!’”
Lawrence, not known to mince words, also flipped the bird while telling the story.
She appeared on the show with Johnny Depp and fellow X-Men: Apocalypse co-star, James McAvoy.
Norton, Depp and McAvoy first appeared shocked, but then exploded with laughter and applauded her gesture.
In a November issue of Vogue, she said: “My view on the election is pretty cut-and-dried: If Donald Trump is president of the United States, it will be the end of the world. And he’s also the best thing to happen to the Democrats ever.”