Songfacts®:

• This was originally intended to be the first single from the re-released and newly packaged version of English singer-songwriter Diana Vickers debut studio album, Songs from the Tainted Cherry Tree. However, the plans were scrapped and it was revealed instead it would serve as the first single from her second album. It was debuted on BBC Radio 1's The 5:19 Show on September 12, 2010.
• The track was co-written by Vickers and songwriter Dee Adams and produced by James Earp. Speaking on a live Ustream chat with fans, the singer said: "I've been working with this really great writer Dee Adams and a really, really great producer called James Earp. I went into the studio and was mooching around and we ended up writing 'Wicked Heart.'"
• The music video was filmed in Los Angeles, United States in mid September 2010.
• Vickers was asked in an interview with Digital Spy about the similarities between this tune and The Red Hot Chili Peppers 1992 song, "Under The Bridge." She replied:"Yeah, that happened without even knowing. We wrote the song in an hour. We had the song and it didn't have the 'My Wicked Heart' bit in it and then we put the vocal in and we were like, 'Why does it sound so familiar?' Then we realised it was because we were listening to 'Under The Bridge' the day before."
  She then went on to admit: "We were saying, 'Should we change it? Should we not? What should we do? Sod it, no, we're just gonna keep it, it works'."
• Vickers told Digital Spy the song is about sexual attraction. She explained: "It's all about when you're really, really attracted to somebody and you really, really want them and just fancy the pants off them. Even if you know that they're with somebody else or you're with somebody else, when they're around it's just like 'Ahh!' and you just wanna havethem. It brings out this wicked side in you."