In case you didn't know, Katy Perry and Taylor Swift are not gal pals.
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According to the latest reports, things are getting pretty heated over who's got the bigger female popstar status.
A source told Hollywood Life that Katy is planning to take a jab at Taylor during her Super Bowl half-time performance (a gig she beat Coldplay and Rihanna to) on 1 February at the University of Phoenix in Glendale, Arizona.