WATCH: Katy Perry Performs ‘By The Grace of God’ at iTunes Festival 2013 [VIDEO]

VideoVideo related to watch: katy perry performs ‘by the grace of god’ at itunes festival 2013 2013-10-01T12:22:49-04:00

Last night, Katy Perry performed a new song called “By The Grace of God,” which is a breakup ballad off her upcoming album “Prism.” Many think it has to do with her highly publicized divorce from Russell Brand. Watch the heartfelt video of her performance.