With all due respect to Nicki Minaj and Mariah Carey, the biggest ongoing beef in the pop world belongs to Taylor Swift and Katy Perry.
As the story goes, Swift accused Perry to
Entertainment 
CBS
Katy Perry Opens Up About Taylor Swift Beef: ‘She Started It’
FEUD
The pop superstar explained Taylor Swift’s long-standing beef with her on ‘The Late Late Show’ Monday night.
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