Cheryl Cole reveals which ex Craziest Things is about as her niece auditions for X Factor

We've been itching to know who 'Craziest Things' is about, and now Cheryl Cole has revealed all.

Cheryl Cole, A Million Lights, album signingCheryl Cole at A Million Lights album signing in London. Copyright [Wenn]

When the lyrics to Cheryl Cole's 'Craziest Things' were released, tongues were wagging that the lines about a bad relationship related to Chezza's ex-hubby, Ashley Cole.

The words include: "We say the craziest things like I love you, hate you, don't need you, f*** you."

However, Cheryl Cole has now revealed 'Craziest Things' is in fact about a romance much further back in her dating history.

[Related article: Cheryl Cole to join rumoured boyfriend Wretch 32 at T4OTB?]

The duet with Will.i.am is about Cheryl Cole's teenage relationship with a 'junkie', the Sun reports.

The 28-year-old revealed to We Love Pop: "I was in the worst relationship of my life.

"We swore, we fought, we did everything it says in that song. People think it's passionate and fun, but it's aggressive and wrong. I was depressed and poorly. I had to end it for my health."

Cheryl Cole was in that relationship from 16 to 18 while living on Newcastle's Heaton estate.

Cheryl Cole, A Million LightsCheryl Cole is promoting A Million Lights. Copyright [Wenn]

While Cheryl Cole is busy with her hugely successful career, her niece Melissa Armstrong is just starting out on her steps to stardom.

The 21-year-old auditioned on the X Factor in Newcastle yesterday, revealing to the panel she is the step daughter of Cheryl's brother Joseph so she couldn't audition when her aunt was a judge.

[Related article: X Factor Newcastle auditions]

Cheryl Cole's niece Melissa Armstrong even sang her aunt's hit 'Promise This'. Brave.

Louis Walsh backed her while Nicole Scherzinger said: "I could see you doing country music or in a girl band" and wanted to put Melissa through to the next round, the Mirror reports.

However, Gary Barlow and Tulisa Contostavlos said no so she didn't make it.