Taylor Swift's latest chart-topper I Knew You Were Trouble was written about the heartbreak she suffered after Harry Styles cheated on her when they secretly dated last spring, Breaking Celebrity News is exclusively reporting.

Taylor, 23, and Harry, 18, made headlines late last year when they went public with their relationship but as Breaking Celebrity News exclusively reported in October, the couple first dated in April but ended on a sour note when the One Direction singer was snapped kissing a leggy model while in Australia — breaking Taylor's heart.

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