Speaking on a live Ustream chat with fans, the singer revealed that 'My Wicked Heart' will be available to download on October 24. A physical release follows the next day.
Vickers said: "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'.
"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'.
"I was so excited about it and just so enthusiastic and 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.
"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."
The former X Factor star's debut album Songs From The Tainted Cherry Tree will also reportedly be re-released with the single and other new tracks.