Taylor Swift's 'I Knew You Were Trouble' video is based on real life experiences, the country-pop superstar has revealed. The new single is based on one of the singer's past relationships and the video tells the story of a girl getting sucked into a relationship while losing her true identity in the process.

"I had just gone through an experience that made me write this song about like knowing the second you see someone, 'Oh this is going to be interesting. It's going to be dangerous, but look at me going in there anyway', she told MTV News. Hmmm, so who could the song and video be about? Her current squeeze Harry Styles is too recent, while Joe Jonas doesn't really fit the 'dangerous' tag. Taylor Lautner is hardly a bad boy, so that leaves blues musician John Mayer, Jake Gyllenhaal and Conor Kennedy. Swift explained, "My favourite thing [about the video] is that this girl not only gets sucked into this relationship with him but she loses who she was before and that's the saddest part of losing him, is that she can't remember who she was before she met him." Things seemed to be going swimmingly for Swift and Kennedy, while her relationship with Gyllenhaal was surely too brief to really 'change' her. It's got to be Mayer, right?

I Knew You Were Trouble is the second single from Swift's huge selling album Red. Like first single We Are Never Ever Getting Back Together, it was co-written and co-produced by Swedish pop producer Max Martin  - the man behind Maroon 5's One More Night, Katy Perry's I Kissed A Girl, Britney Spears' Hold It Against Me and Taio Cruz's Dynamite.

Watch Taylor Swift's 'I Knew You Were Trouble' video