Taylor Swift’s “Trouble” Track About Harry Styles

Taylor Swift's "I Knew You Were Trouble" is "100 per cent" about Harry Styles.

The singer had an on/off relationship with the One Direction hunk last year, with them initially splitting in April when he was spotted kissing a model in Australia. They then reconciled for two months at the end of the 2012, but split over New Year while holidaying in the British Virgin Islands. Now a friend has confirmed Taylor's single "I Knew You Were Trouble" - one of her famous break up songs about her exes - is about their romance.

"Taylor was crushed over Harry the first time they dated, and like she always does, she penned a song about him to deal with her broken heart. 'I Knew You Were Trouble' is one hundred percent about Harry. She knew he was young and popular with the ladies and wasn't ready for a serious relationship, but somehow hoped she could make it work," the source said.

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