The latest budding best friend duo of Amy Schumer and Jennifer Lawrence stopped by Wrigley Field in Chicago last night for a surprise appearance in the midst of a Billy Joel performance. A Dance party ensued onstage once the Pia** man began playing "Uptown Girl." Schumer was the first to bust a move, followed by a group of friends including Lawrence. The two actresses, barefoot, jumped on top of Joel's Pia** for a jig while the singer serenaded them.