Published Tuesday, 31 January 2012
The girl group, which also features Cheryl Cole, Sarah Harding, Kimberley Walsh and Nadine Coyle, is currently on a break while the singers concentrate on solo projects.
Roberts recently released her debut solo album, Cinderella's Eyes, but she was originally "angry and frustrated" with the hiatus as she didn't know what to do with her time.
She tells the Daily Express: "I didn’t know how I was going to have music in my life until the band had another record. Before I started making the (solo) album I felt so frustrated I wasn’t making music and I felt like I couldn’t see music in my life for a long time.
"It really made me sad. I felt like I wanted to be a singer and I used to write a little and then all of a sudden the band went on a break and management were trying to find different things for me to do - this TV work, that TV work - and it was just like: ‘This is really sad, actually.’ It really wasn’t sitting well with me at all.
"I was frustrated and angry inside every day. That’s what the song Fish Out Of Water was about: 'What, am I supposed to just find another career because the band is on a break?' That’s how I felt."