Justin Rocks Hollywood, K-Fed's Body

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Justin Timberlake's member didn't show up in a box, but K-Fed danced in one. In fact, young Hollywood's elite -- including bachelor Kevin Federline swaying in a VIP balcony -- packed L.A. club Avalon Friday night for a private concert by Timberlake and his pals The Black Eyed Peas, Nelly Furtado and Timbaland. The invite-only show, hosted by Verizon Wireless and Rolling Stone, kicked off Grammys weekend and was held officially to celebrate the launch of T-Lake's new mobile channel. But Usmagazine.com was really there to gawk and talk with celebs -- and pretend we were watching the rockin' show while not-so-secretly obsessing over the night's soap-operatic sub-plots: In-love Nick Lachey and Vanessa Minillo ignoring Joe Simpson as he walked by their VIP table, Timberlake and Federline on the red carpet man-hugging, Timberlake's current flavor of the moment Scarlett Johansson gazing adoringly in the audience, The Hills stars Lauren "L.C." Conrad (sans sidekick Heidi Montag) and ex Brody Jenner avoiding each other, and newly single Cisco Adler dealing with his breakup with Mischa Barton like, uh, Michael Jackson might: wearing eyeliner and full-on makeup. But we knew we were vibrating at the epicenter of a celebrity earthquake when Paris Hilton started doing one of her party-girl jigs and hardly anyone noticed. Or, as Conrad put it, "Everyone's here tonight!"Yeah, everyone but Cameron Diaz.