A breathtaking mansion in the Hollywood Hills above Sunset was the expensive setting for the launch of Helio, the latest mobile service device (aka a phone with lots of bells and whistles, including being an MP3 player and video screen), so naturally Tinseltown’s hottest 20- and 30-somethings had to make the scene.

"That 70’s Show" star Danny Masterson was the nominal host for the party, along with Milla Jovovich and Chloe Sevigny. He’s already a big fan of the Helio. "It’s got a lot of cool elements to it," he raved.

His co-star Laura Prepon agreed, along with a bevy of beautiful faces from television ó "Nip/Tuck" beauty Rhona Mitra, "JAG’s" Catherine Bell and "One Tree Hill" star Sophia Bush, as well as film stars Sanaa Lathan, Michelle Trachtenberg and Rachael Leigh Cook. Those glittering gals were matched by a bunch of handsome men, including Simon Rex of "Scary Movie" fame, cutie Nick Cannon, Isaiah Washington and Asian hottie Rick Yune.

With a broad vista of the L.A. basin twinkling below, guests sipped expensive liquors, sampled pizza and sushi appetizers, and shouted out over the alternative rock sounds of Ringside and the spinnings of the latest DJ in town, Tendaji Lathan. We spotted Good Charlotte’s Benji Madden and singer Bush, but neither one made a move for the outdoor stage.

Everyone in the select crowd went home with a goodie bag containing that new Helio Kickflip device, which was the real reason for making the trek to the hills. Forget free food, booze and music ó this was one Hollywood party that was all about the expensive swag.