For many celebrities, an Oscar red carpet cameo is months in the making. Such procedures as Botox or fillers, which can cause bruising, are best done a couple of weeks ahead of time. Eyelash treatments, including Latisse, show optimal effects on week 16. And a healthy diet and exercise, plenty of water and sleep, and reduced alcohol are always recommended. However, for awards-goers looking to give their skin a pre-Oscar boost, these star-favored facial treatments require surprisingly little lead time. Beverly Wilshire, Beverly Hills The spa at this hotel famously featured in “Pretty Woman” is the only one in the world to offer Elemis Targeted Toning — a facial and body treatment that reduces the appearance of cellulite and lines. All body parts can be treated even the day of, and a red carpet package includes a David Webb jewelry box. Prices start at $505 310-385-7023 Biba de Sousa Beverly Hills-based esthetician Biba de Sousa — who works regularly with Emily Blunt — gets skin awards-ready with a two-and-a-half-hour session. In addition to OxyGeneo, a three-in-one facial, she does Pressotherapy, a detox treatment to prevent pain and swelling (from, say, killer heels). $330-$450...