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Katy Perry Goes to War on 'American Idol'

Katy Perry gives a military-themed performance on 'American Idol'.

http://www.ksdk.com/video/1614033699001/1/Katy-Perry-Goes-to-War-on-American-Idol http://cdn.newslook.com/4a/4ac25295ed0f9c8ec9ee9ee922ec91ed/images/frame_0000.jpg Katy Perry Goes to War on 'American Idol' Katy Perry gives a military-themed performance on 'American Idol'. musicAmerican IdoltvnewslookKaty Perrycelebrity newsNewsentertainment 00:46

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