"I had my first real sex scene a couple weeks ago," she said to the group that included Kate Winslet, Cate Blanchett, Carey Mulligan, Brie Larson, Helen Mirren, Charlotte Rampling and Jane Fonda, "and it was really bizarre. It was really weird."
If you don't know, she's talking about an upcoming science fiction movie called Passengers that Chris Pratt also happens to star in.
When asked how she prepared before filming with the Jurassic World star, the always candid superstar got right to the point.
"I got really, really drunk," she admits. "But then that led to more anxiety when I got home because I was like, "What have I done? I don't know." And he was married. And it was going to be my first time kissing a married man, and guilt is the worst feeling in your stomach. And I knew it was my job, but I couldn't tell my stomach that. So I called my mom, and I was like, "Will you just tell me it's OK?" It was just very vulnerable. And you don't know what's too much. You want to do it real, you want everything to be real, but then … That was the most vulnerable I've ever been."
Of course, Pratt is happily married to Mom star (and the mother of his son) Anna Faris.
And while Passengers won't hit theaters until December 2016, you can fill in your freetime with a video Pratt posted recently that might make J.Law feel even worse about her fake sexy times with Faris' man.