One minute Sarah Harding's in her naughty schoolgirl uniform - and the next she's all Dolled up.Or is she? Look closer and you'll realise that the lady in the blinging frock (left) is actually Pussycat Doll Kimberly Wyatt.Still, it's an easy mistake.Kim tells us: "I looked in the paper the other day and thought, 'There I am'. Then I realised it was Sarah from Girls Aloud. She looks a hell of a lot like me."Blimey, she'd really freak out if she saw Sarah's stunt double, below, for the St Trinians film!