Katy Perry and Luke Bryan battle it out in a moo-off on American Idol as Lionel Richie officiates. (ABC Photo)

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Katy Perry and Luke Bryan battle it out in a moo-off on American Idol as Lionel Richie officiates. (ABC Photo)

Katy Perry and Luke Bryan battle it out in a moo-off on American Idol as Lionel Richie officiates. (ABC Photo)

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