Here in the U.S. we know Katy Perry as that “I Kissed a Girl” girl and Lily Allen as that British Britney-Spears-esque mess. But across the pond, they are bona fide pop stars who really don’t like each other.
 

The latest battle began when Perry referred to herself as “a skinnier version of Lily Allen.” You don’t call Lils fat and get away with ...

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