<P> "I Knew You Were Trouble" received generally positive reviews from music critics, who commended its mainstream appeal yet noted Swift's experimentation with dubstep as relatively limited . Due to strong digital sales, the song debuted at number three on the Billboard Hot 100 chart in the United States, selling more than 416,000 copies within its first week; it later peaked at number two in January 2013, blocked from the top spot by Bruno Mars's "Locked Out of Heaven". At the inaugural YouTube Music Awards in 2013, "I Knew You Were Trouble" won the award for YouTube phenomenon . The single has been certified sextuple platinum by the Recording Industry Association of America (RIAA). The song had sold 5 million copies in the United States alone by 2014 . </P> <P> During her performance at the 2012 iHeart Radio Music Festival in Las Vegas, Swift told Rolling Stone magazine that she would start unveiling the songs from her fourth studio album, Red, one - by - one . "Starting this week I'm gonna start unveiling new music...I really want there to be so many surprises left on the record for when it comes out eventually, some collaborations that haven't been talked about and some songs that are definitely what make the album so unique," she added . Talking about the accompanying tour for the album, the singer explained that she always thinks about the visuals associated with a song--"Ooh, how are we gonna play this in concert? What's the lighting gonna be like? What costumes are we gonna have?"--and one of the songs that stood out to her for its visual aspect was called "I Knew You Were Trouble .". </P> <P> The song was written by Swift, Max Martin and Shellback, the latter two also producing the track . When Swift previewed the song on Good Morning America on October 8, 2012, she said that it was "one of (the singer's) favorite songs on the album because it sounds just as chaotic as the feeling was when I wrote it . The song is about being frustrated with yourself because here you are heart - broken and you knew when you first saw that person you saw all these red flags and you just went for it anyway, so shame on me ." Initially the media had speculated the song to be about her ex-boyfriend, singer John Mayer, in light of her previous song "Dear John" from her third studio album, Speak Now (2010). In an interview with MTV, Swift further explained that the song told the story of a good girl falling for the bad boy and continues about a "toxic relationship" between them, resulting in break - up . Talking in - depth about "I Knew You Were Trouble": </P> <P> "I had just gone through an experience that made me write this song about like knowing the second you see someone like,' Oh, this is going to be interesting . It's going to be dangerous, but look at me going in there anyway...I think that for me, it was the first time I ever kind of noticed that in myself, like when you are curious about something you know might be bad for you, but you know that you are going to go for it anyway because if you don't, you'll have greater regrets about not seeing where that would go, but I think that for me it all went along with this record that was pushing boundaries, like the sound of this record pushes boundaries, it was writing about something I hadn't written before ." </P>

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