Katy Petty.

Earlier today, news broke that singer/songwriter/lawsuit enthusiast Taylor Swift helped co-write (and provide background vocals) for "This Is What You Came For," a collab between her ex, Calvin Harris, and Rihanna.

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This set Harris off on a Twitter rant begetting of a 32-year-old-man, where amongst other things, he touched upon Swift's long-standing feud with fellow pop star Katy Perry.

Twitter: @CalvinHarris

People around the world were waiting for one of Katy's legendary tweets in response to today's events. Just like Anderson Cooper reports the news, Katy Perry gives HER take on Taylor Swift drama.

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