In her appearance on 'The Graham Norton Show' on Friday, she told the audience about the time she found out she was at the same concert as the orange-faced Republican, so she sent her entire security detail to find him.
Just so she could give him the finger and yell "fuck you".
Watch the full clip below:
"I had my full security, like, I was like, 'Find Donald Trump,'" she said. "'Cos I was just adamant on finding him and then making a video of me going, 'Hey Trump, f*** you!'"
Sadly J-Law didn't manage to find him.
The anecdote came after Johnny Depp spoke about his time playing Donald Trump in Funny Or Die's 80s style mockumentary, a 50-minute film that was recorded in just four days.
She then went on to talk about the time she was totally snubbed by Harrison Ford.
“I probably humiliated myself more than ever before,” she said. “I never assume anyone knows who I am, but when I spotted Harrison Ford and J.J. Abrams I was like, ‘It’ll be fine, we’re all co-workers, right?’
“So I went up to them and started dancing like an idiot and the whole table just went quiet and stared at me."
Poor Jennifer. Apparently the 'Star Wars' actor knew who Jack Whitehall was, but not her.