TINSELTOWN SPYWITNESS.

Byline: Elizabeth Snead and Joel Stratte-McClure

THAT'S ALL RIGHT: Who's that girl? The new face of Miss Dior is Riley Keough, Elvis' granddaughter. The stunning 15-year-old has already walked the Paris designer runways.

Was she nervous? ``The first time you go out there, it's pretty scary but then it gets fun,'' Keough said Thursday at the private Dior party in the Soho House. She and pal Kate Bosworth both wore Dior, with faces done by makeup artist Patti Dubroff.

The Miss Dior fragrance (think strawberry and popcorn) will be as sweet as Keough. ``She's very gentle, an old soul,'' says Dubroff. And what does mom think of her modeling career? Before Keough could answer, a protective publicist snapped, ``No questions about her mother!'' Word is Lisa Marie Presley is worried, as any mom would be. Kids! They're either playing in the street or becoming supermodels.

RUB ME THE RIGHT WAY: There's a lot of pressure on stars to look hot at the Oscars. But they have help from the L.A. beauty industry that caters to Oscar prep.

The Soho House, the invitation-only club for celebs, was the most discreet Oscar prep outlet, offering Diamond Aquifer treatments (even diamond teeth polishing), Cowshed facials and massages, Bumble and Bumble hair, and MAC makeup done by makeup artist Gregory Arlt all week.

The hillside villa high atop Mount Olympus also hosted private parties, including Drew Barrymore's birthday bash.

Jude Law's girlfriend Sienna Miller had her makeup done by MAC's Arlt. Seems she loves MAC's Love Nectar lip gloss. Arlt will do Pamela Anderson's makeup on Oscar day but sounded more excited about doing Miller's makeup for the new film ``Edie.'' She'll portray Andy Warhol's drug-addicted Factory femme fatale/heiress Edie Sedgwick. What, Paris Hilton wasn't available?

Miller and Mischa Barton also got facials at Z. Bigatti and more makeup at Stila in the Red Carpet 05 Beauty Lounge at the Pacific Design Center. The PDC was buzzing with stars all week, but that could also be because it's now headquarters for several powerful Hollywood publicity agencies including PMK-HBH and Rogers and Cowan. We hear this has shifted power lunches from hoity-toity Beverly Hills to Santa Monica Boulevard restaurants like the Palm, the Abbey, Kinara, Sur and Fat Fish on Robertson Boulevard, and Urth Cafe and Elixir on Melrose Avenue.

Frederic Fekkai on Rodeo Drive was buzzing with stars all week. Kelly Lynch, Kim Raver, Emmy Rossum and Patricia Heaton came in for mani-pedis, facials and hairstyling. High on the list: European Plasma (with human placenta) Facials. Nicollette Sheridan stopped by Thursday for a de-stressing massage and deep conditioner, chatting briefly with a pal about their pooches and doing Runyon Canyon runs. Rumor is that Fekkai's beauty team will go to Cate Blanchett Sunday morning to get her ready for the red carpet.

HIGH GEAR: Mix hot babes, fast cars and cool threads. Toss in an Oscar nominee (or two) and you've got the fourth annual GM ``ten'' event previewing their new cars (including a hydrogen Hummer!) Tuesday under a giant tent at Hollywood and Vine.

Even torrential rains couldn't drown the crowd's enthusiasm for the stars and cars rolling down the runway.

Models included Anthony Kiedis, Daisy Fuentes, and Hilary and Haylie Duff, still looking like mall rats in shredded chiffon gowns. India.Arie strutted in a gold lame dress that could have walked Hollywood Boulevard. ``Napoleon Dynamite'' star Jon Heder had the crowd roaring with his geeky dance moves. ``Nip/Tuck'' star Julian McMahon carried his tiny Yorkie. Who does he think he is, Paris Hilton? ``Insider'' host Pat O'Brien's face was as pink as his sports coat. ``Boston Legal'' hottie Rhona Mitra flowed in a gold gown, dragging her white bulldog named Oscar.

Real Oscar nominee Catalina Sandino Moreno didn't look very full of grace in her stiff ballerina ball gown. But Oscar front-running ``Ray'' star Jamie Foxx got the crowd clapping when he sang, then whipped off his white jacket.

In the audience: Amanda Peet, David Spade, a skinny Tori Spelling, a not- skinny Penny Marshall, John Stamos and Chris Kattan. Ashton Kutcher sat in the front row with Demi Moore (and they said it wouldn't last). Both of them wolf-whistled and applauded the models. Moore looked anything but matronly in a plaid puff-sleeve dress by Roland Mouret and long pearls.

On Tuesday afternoon, Moore had been rock hunting at the Soho House's Oscar-oriented Diamond Aquifer suite. She even watched a diamond facelift and chakra diamond therapy. ``It's smart because diamonds hold energy and are known for their healing attributes,'' mused Moore. So that's why Kobe Bryant gave his wife a $4 million diamond - for its healing properties!

What's Moore planning for Oscar night? She's not sure. She may hit a party. She may stay home in bed. With her ``diamonds and pajamas,'' she joked. And Ashton Kutcher, we presume.

`TEN' PLUS: What's hotter than colored diamonds? Pearls! Demi Moore did multiple pearl necklaces at the GM ``ten'' event. Word is Catalina Sandino Moreno will wear Autore South Sea pearls to the Oscars tonight. Look for a deco-style pearl and diamond necklace, earrings and cuffs.

WE SAW U

Talk about a face off! Best actress nominees Hilary Swank and Annette Bening bumped into each other at Kinara Spa on Robertson Boulevard Thursday. But no catfight. They just laughed and hugged. Kinara is turning into Nominee Central. Supporting actress nominee Virginia Madsen also came in for a facial and massage.

CAPTION(S):

4 photos

Photo:

(1 -- color) KEOUGH: She's Miss Dior, but you can call her Riley.

(2 -- color) SHERIDAN: Give that woman a rubdown!

(3 -- color) MILLER: Factory fresh for ``Edie'' role.

(4 -- color) KUTCHER and MOORE: Hey dude, where are my pearls?