Your move, Taylor Swift. Last night Billy Joel had Jennifer Lawrence and Amy Schumer join him on stage at Chicago's Wrigley Field.  The two funny women danced on his piano to "Uptown Girl"—which, apparently, required some practice. Earlier that day, Inside Amy Schumer writer Kyle Dunnigan had posted video captioned, "Rehearsals a lil rough."

The 1983 classic is featured prominently in Amy's debut flick Trainwreck, which made $30 million in box office sales during its first week.

Get ready to see Jennifer and Amy together a lot more often. They're writing a comedic screenplay, which has them co-starring as sisters. “We’re almost done writing," Jennifer said to The New York Times. "It just flowed out of us. We’ve got about 100 pages right now.”