The 33-year-old Irish singer has further opened up on relations in the girl group and has admitted that she and the other four members - Cheryl, Sarah Harding, Nicola Roberts and Kimberley Walsh - didn't get on.
Appearing on this week's episode of comedy panel show 'Celebrity Juice' host Keith Lemon said to Nadine, ''You were in Girls Aloud, who was your favourite?''
Pulling an awkward expression, Nadine said, ''Them all,'' before laughing out loud.
Fellow guest Kaiser Chiefs frontman Ricky Wilson then asked: ''Who was your favourite in Girls Aloud?''
Prompting Nadine to respond: ''Sarah.''
Keith continued the interrogation by asking: ''Do you see any of them still? I heard you fell out?''
Nadine then said: ''No. It's for the best ... There was no falling out, there was just no friendship to begin with.''
Prompting a gasp from the audience, Keith then added: ''Is there going to be a reunion?''
To which Nadine said with a smile: ''Probably!''
Following their split in 2013, Nadine has not been shy to air her grievances about her time in the pop band and has claimed that the other girls were jealous because she was given the most lines to sing in their hits.
The 'Biology' singer previously said: ''A thing that did cause stress in the band was the fact that I was given more lines and the girls didn't like Brian [Higgins, Girls Aloud collaborator and the mastermind behind pop production team Xenomania] as a result of it.
''They didn't like the label as a result of it, and they didn't like me as a result of it. So it was just circumstances which were out of my control: I didn't decide who sang what. But I love my life and I just get on with it.''
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