ShowbizAlexa Chung has Pixie'd on the wrong girlMax Thurlow|London Lite11 April 2012Pixie Geldof swore at Alexa Chung from the catwalk at Vivienne Westwood.Nice little gurner: Alexa in front rowA fashionista at the London Fashion Week show told us: "Alexa was pulling faces and forming two fingers to try to distract Pixie. The next time Pixie appeared in the show she discreetly posed with her two middle fingers up — but with a big grin on her face."Well, Pixie, 19, IS the offspring of Bob "Give us your f****ing money" Geldof...MORE ABOUTLondon Fashion Week