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

Published:12:22 pm EDT, October 1, 2013| Updated:12:22 pm EDT, October 1, 2013|
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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.

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