Kristen Stewart is learning what fame is about very quickly now that Twilight has officially hit theaters. She has gone from a working 18 year old actress to the center of Twilight mania. Kristen sent the early part of this week in New York chatting it up with David Letterman and quickly flew across the country for the LA premier of her new tweener vampire flick. She had to rush through LAX as paparazzi snapped her picture. This is a new world for Stewart and she better get used to it for awhile…especially if Twilight ends up being as big as the studio hopes.