Bridget Jones would give anything to stand out in a crowd. But even the desperate diarist might draw the line at the arduous beauty regime endured by the actress who portrayed her. Renee Zellweger's polished red carpet look is down to a harsh routine that includes 'facial sand-blasting'. The effects, however, are dramatic. The treatment transforms Miss Zellweger from a blotchy Bridget into a radiant Renee. Before every premiere, the 37 year old actress undergoes the process designed to rid her skin of blemishes and keep her looking young and fresh. her last session was at the Bliss spa in Chelsea earlier this month. the day before the premiere of her latest movie, Miss Potter. During treatment costing 145, her face is firstly cleansed and exfoliated. Then it is wrapped in two sheets of cling film and a special facemask to open up the pores. This "pre-extraction oxygen wrap" shrouds her face, leaving only her nose exposed. The cling film helps activate the oxygen and milk facemask under-neath, which opens the pores. after the film and mask is removed, an oxygen spray containing vitamins A, C and E is sprayed on her face and neck. oxygen kills surface bacteria to help keep skin clear and blemish-free. Then comes the hour-long "sand blasting", or to give it its technical name, microdermabuffing. Aluminium oxide crystals, hailed for their anti-bacterial properties, are sprayed on to the face in a procedure which helps reduce age spots and the sun damage, and smooths out the onset of fine lines and wrinkles, After the three-hour session, the actress must avoid direct sunlight and not wear make-up for six hours. A source close to Miss Zellweger said: "She discovered the triple oxygen facial a couple of years ago and been a convert ever since."