Just because! Jennifer Lawrence and Amy Schumer hopped up onstage during Billy Joel’s performance of “Uptown Girl” in Chicago on Thursday, Aug. 27, and took it a notch higher by dancing barefoot on top of his grand piano. Footage from the concert shows the stars — who shared an epic run-in at the Hamptons last month — joining Joel, 66, during his spirited performance of his 1983 smash single. Schumer, 34, clad in a black tank and matching pants, stormed the stage with her new BFF Lawrence, 25, who looked cute in distressed denim and a breezy white top.

The girls first delivered a synchronized performance onstage with a group of fellow Joel enthusiasts, then broke away from the bunch, took off their shoes, and made their way on top of his piano.

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– Events From 2015 > August 27th: Billy Joel Concert At Wrigley Field