By Staci Wuokko, CBS Radio Chicago
The comedian and actress let loose and danced barefoot on the singer’s piano while he performed his hit “Uptown Girl.” Schumer used the popular tune in her movie “Trainwreck,” which came out this past summer.
While Schumer slid onto the instrument, Jennifer Lawrence gave her a boost and kissed her feet.
The duo rehearsed their choreography with Billy in Wrigley Field before the concert.
Watch the video above and read the full story now at US99.