Christie Brinkley gives a lesson in how to be fabulous at 57

She was warned when she began modelling that her career would be over by the time she turned 30.But at 57, Christie Brinkley shows no sign of losing her Uptown Girl appeal.The mother-of-three proved she still knows how to turn heads yesterday in New York as she showed off moves from her role as Roxie in the Broadway version of musical Chicago.And in a skintight red Herve Leger dress, the