Rather than leaving the party in tears as first reported the source said that Cheryl, 27, 'fought back' against Macdonald's unprovoked insults at a party organised by Girls Aloud band-mate Sarah Harding.
The insider told The Mirror that Chezzer shouted, 'Get out of my face... F**k you. Did you hear what I said? F**k you.'
Talking about Macdonald's outburst, they added, 'It was really abusive. Julien just started going off on one, saying she looked like a chav with her hair and that her dress sense was 'hideous'.
'It was totally out of order. He really tried to humiliate Cheryl. But he was lost for words when Cheryl fought back.
'She wasn't about to take it lying down. Cheryl was with friends and having fun. The last thing she expected was a public ear-bashing from Julien.'