Michelle Pfeiffer once credited Giorgio Armani, to whom she turned for every public appearance, with keeping her off the worst-dressed list. But during her recent red-carpet marathon of “Hairspray” and “Stardust” openings, it seems The Face has stepped outside of her comfort zone. She called on young designers Lela Rose and Jenni Kayne for two separate occasions, and Rose, for one, was starstruck. “It’s a very classic look,” she said of the white lace dress Pfeiffer chose, “which is what you should wear when you receive your star on the Hollywood Walk of Fame.” Still, for someone whose on-screen look has varied from mobster missus to latex-wearing feline, in real life, Pfeiffer is pretty formulaic: form-fitting, knee-length frocks; artfully tousled hair; natural makeup, and a good pair of peep-toes. Meow.