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Available to download on October 24, a physical release of her latest single will come out the following day.
'The third single is a brand new track which none of you have heard and I'm really excited about this. It's called My Wicked Heart,' the X Factor star told fans during a live Ustream chat.
'I've been working with this really great writer Dee Adams and a really, really great producer called James Earp,' she added.
'I went into the studio and was mooching around and we ended up writing Wicked Heart.'
V Festival 2010: Diana Vickers flashes her knickers on stage
Diana went on to admit that she was 'so excited' and 'just so enthusiastic' about recording.
'I always think - since I started and I recorded the first album - that I've grown so much, my voice has become stronger and I loved doing all my live shows,' she gushed.
'I just wrote the track and I thought it was so wicked and I couldn't wait to show you all. So we've got it as the third single and I'm really excited about it.'
Diana has also just confirmed a headline show in an as-yet-unnamed London venue as part of September's month-long Oxjam festival.
Happening on September 28, the event is in support of the charity Oxfam and will also feature performances from Gabriella Cilmi and Pearl & The Puppets.
According to Vickers' website, the location of the show will be revealed a mere 72 hours before it takes place.