Last night, Billy Joel proved Taylor Swift isn't the only pop star who can get some A-list surprise guests onstage. During his concert at Chicago's Wrigley Field, he started in on his mega-hit "Uptown Girl" when, in a nod to one of the best Trainwreck scenes, Amy Schumer hopped onstage and began dancing around to the song only to be joined moments later by her future co-star, Jennifer Lawrence. The twosome, along with some other guests, started doing Rockettes-style high kicks and even danced atop Joel's piano. The whole thing was a damn delight. Watch it above.