The Girls Aloud bandmates had a chance meeting at London club Rose and despite constant speculation of a rift between US-based Nadine and the rest of the group, they appeared in good spirits and were enjoying one another's company.
An onlooker told the Daily Mirror newspaper: ''Nadine squealed with delight when Cheryl walked in. The girls shared a bottle of champagne. They hugged out their differences and even had a dance. Cheryl also got a round of shots in.''
The pair stayed at the venue until around 3.30am but left separately.
She said: ''They're not my friends. I don't speak to them or socialise with them. I have my own friends that I've grown up with and the girls are very much my colleagues. I wouldn't socialise with them outside of work.''
The group are expected to reunite later this year following a lengthy hiatus.