Taylor Swift dropped a major bombshell yesterday when she revealed that she's sworn enemies with another female artist. With clues like "she would come up to me at awards shows" and "she basically tried to sabotage [my] entire arena tour," we couldn't help but put the pieces together. Not only do Katy Perry and Taylor not talk as much as they used to, but the "Firework" singer hired a few of Taylor's dancers right out from under her during her Red tour!

Katy all but confirmed our suspicions today when she tweeted:

Ouch! Apparently Katy's not afraid to be catty!

Click through to see more of the biggest celebrity beefs of all time, then let us know in the comments below which ones shock you the most. Do you think Katy's name calling was uncalled for?

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