TAYLOR SWIFT My Bloody Valentines!

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Today is Valentine's Day ... a holiday that commemorates the day on or about the year 270 A.D. ... when St. Valentinus was beaten with clubs and beheaded by the Romans (look it up).

And to honor him, here's a photo gallery of Taylor Swift with all of the people she's rumored to have hooked up with.

They are never, ever, ever ...