It all began with an "I'm in love with you" fan letter. Then, it escalated to a boating trip to The Hamptons and a screenplay collaboration. Yesterday, the budding friendship between Jennifer Lawrence and Amy Schumer solidified itself in "Squad Goal" history books everywhere (sorry) when the two appeared at a Billy Joel show in Chicago, unannounced, barefoot on his piano for "Uptown Girl."
Watch the surprise -- but not at all surprising -- appearance from the newly-minted BFFs, below. There is feet-kissing.