Jennifer Lawrence and Amy Schumer Danced Barefoot on Billy Joel's Piano in Chicago - See the Video!

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Amy Schumer and Jennifer Lawrence are working hard to win the award for most amazing celebrity besties.
The comedian and Oscar winner joined Billy Joel on stage for his concert at Chicago's Wrigley Field, where the actresses climbed onto Billy's piano and danced to a performance of his hit song "Uptown Girl" (a song that also plays a big role in Amy's film Trainwreck).
WATCH: New Squad Goals! Jennifer Lawrence and Amy Schumer Ride Out on a Jet Ski!
Amy and Jennifer looked to be having the time of their lives as they danced around on stage in front of the huge crowd.
It also seems like the two are as close as friends can possibly be -- especially with Jennifer literally kissing Amy's feet as she climbed up on Billy's grand piano.
Now that really is a sign of true friendship -- or maybe Jen is just an adorable weirdo.
Amy and Jen actually spent the whole day getting ready for the big night. The two rehearsed with Billy in an empty Wrigley Field hours before the concert.
It seems the two celebrated stars have been spending a lot of time together in recent weeks. Aside from Jen joining Amy and her friends on a fun vacation getaway last month -- which included jet skis and human pyramids -- the dynamic duo are also reportedly working on a movie.
WATCH: Jennifer Lawrence and Amy Schumer Will Play Sisters in a Movie They're Writing Together!
On Wednesday, the 25-year-old Hunger Games star revealed that she and Amy, 34, have written a screenplay together and plan to co-star as sisters! Check out the video below to hear more about the potentially epic project.