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What Happened Between Katy Perry And Lady Gaga? - TheThings
Why Katy Perry's comeback has gone so wrong - BBC
Nine years ago, it was Lady Gaga's "Applause" vs. Katy Perry ... - Queerty
Lady Gaga, Katy Perry and the art of the modern pop comeback
Katy Perry: “Woman’s World” Track Review - Pitchfork
How Lady Gaga, Katy Perry, TMZ were involved in Kesha and Dr.
With “143,” Katy Perry Is No Longer in on the Joke
Katy Perry Beats Lady Gaga For The Most Diamond-Certified ... - Forbes
Lady Gaga Attends Katy Perry’s Show on Rare Date Night Out …
Lady Gaga and Katy Perry, Preserving Pop’s Old Guard