DJ Chris Moyles unleashed an astonishing new tirade against Girls Aloud star Nicola Roberts on his Radio One show.

The 33-year-old branded the singer a 'sour-faced old cow' who 'looks like she works at Netto' in his on air rant.

He said: 'Nicola is not the most striking one out of Girls Aloud, unless by striking, you mean ginger.

Feud: Chris Moyles launched a new attack on Girls Aloud star Nicola Roberts

'It’s nothing to do with her hair or the way her face or body is, it’s that the sour-faced old cow never smiles – ever.

'She always looks peed off, like she doesn’t want to be in the band.

'Someone should show her the Girl’s Aloud bank account because if she worked at Tesco’s - and it would take a few years to build up to that level for her - she wouldn’t be making the money she’s making now.

'She’s got a great life flying all over the world yet her face looks like she works at Netto.'

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Struggle: Nicola previously said she felt like 'the ugly one in Girls Aloud'

It's not the first time Moyles has expressed his contempt for the 22-year-old - he referred to her as 'the ropey-looking ginger one' in his 2006 book One Man and His Mouth.

Earlier this year, Nicola said of Moyles: 'I can’t stand him. It’s no surprise I look miserable with him on my case. And he’s such a good-looking bloke himself, isn’t he?'

Nicola has previously admitted she suffered from low self-esteem, revealing that she would often avoid looking in the mirror.

'For years I felt like the ugly one in Girls Aloud,' she has said.

'It was weird. I joined this band because my life was all about singing. Then Girls Aloud became successful, and suddenly it wasn’t just about being able to sing any more. It turned into a beauty contest.

'People on radio and television started making nasty comments about me and I felt awful. Turning from a teenager into a woman is hard enough without dealing with snide comments.'

Now, Nicola says she does her best to brush off criticism: 'Ultimately I’m quite a strong person.'