The roster of beauty professionals at this salon and spa reads like a who's-who list that could have been hacked from Paris Hilton's sidekick.

Jessica Simpson's colorist and Cirque du Soleil's former on-tour massage therapist are just two of the celebrity skin, hair and nail specialists now offering their A-list services at the Argyle's luxury spa. The salon snagged stylists from Prive and Cristophe hair salons to man its 12 hair stations and private executive barber station, and guest colorist Rita Hazan, an "Oprah" regular, flies in from New York once a month for a two-day residency. Head-care guru Phillip B., whose products are used by Deborah Messing and Gwyneth Paltrow, offers his signature four-step healing scalp treatment; Philip B. body scrubs are also used in the spa's Turkish bath and skin treatments. Spa director Christopher Warren, who was previously head therapist at Kinara Spa, created a Hot Stone Four Hands massage that's eighty minutes of kneading and rubbing by two therapists in choreographed strokes. The Tri-Active body treatment is highly recommended for post-op therapy after liposuction—how LA. Guests get pampered in-room, at an outdoor cabana, or in a spa suite souped up with a flat-screen TV, a two-person soaking tub, a shower and iPods equipped with guests' favorite playlists. Designer Paul Fortune's work to recreate the glamourous days when Howard Hughes used to reside in the hotel includes a secret exit for (who else?) celeb guests to discreetly leave to an awaiting limo. —Mai Dinh