PRE-OSCARS FACE TIME: Along with the nonstop consulting sessions with stylists, many Oscars-bound starlets and revelers are spending extra time with their personal trainers, Pilates instructors and beauty consultants. Not to miss out, dermatologist and internist David Colbert will have a Beverly Hills satellite office Wednesday through Friday. Rachel Weisz, Naomi Watts, Rosie Huntington-Whitely and Miranda Kerr are a few of his regulars who have already booked appointments. And knowing time is a serious commodity this week, Colbert will be serving up his signature pre-red carpet treatment, the Triad facial. The 30-minute three-step procedure combines French Microdermabrasion, laser toning and lavender flower acid application.