The Geordie beauty attended the launch of the new HTC Sensation smartphone XL with Beats Audio at Camden's Roundhouse last night.
She was pictured grasping a bottle of champagne while swearing at the camera.
But the night seemed to have taken its toll on the Girls Aloud star, if her tweets are anything to go by.
She wrote: 'Why why why why why why why why why... :'('
The 28-year-old added: 'I just walked past the mirror and caught a glimpse of someone. I have no idea who she is. That's it. Me and alcohol are not friends.'