"We play sisters [in the film]," Lawrence said in an interview with the New York Times. "We're almost done writing. It just flowed out of us. We've got about 100 pages right now."
The Oscar-winner also told the Times what everyone really wants to know: How this team-up happened.
"I emailed her after I saw 'Trainwreck' and said, 'I don't know where to get started. I guess I should just say it: I'm in love with you,'" Lawrence recalled "We started emailing, and then emailing turned to texting."
And texting turned into jet skiing together in early August and then writing a movie, naturally.
"Amy and I were creatively made for each other," Lawrence said. "It's been the most fun experience of my life. We start the day off on the phone, laughing. And then we send each other pages. And we crack up. We'll write a little bit with her sister, Kim, who worked with Amy when she was writing 'Trainwreck.'"
No word yet when (or if) this movie will hit theaters, but we wanna already buy our tickets.