VIDEO : Jennifer Lawrence Dances Barefoot on Billy Joel's Piano, Kisses Amy Schumer's Feet

Jennifer Lawrence and Amy Schumer continued to prove they have the best friendship ever on Thursday when they got on stage at the Billy Joel concert in Chicago. Inside Amy Schumer writer, Kyle Dunnigan, posted a backstage video of the moment on his Instagram. Jennifer even kissed Amy's feet before they hopped on top of the singer's piano to show off their moves. Jennifer and Amy's antics come on the heels of the exciting news that the two are writing a screenplay together .