It was utter madness at the Kress on a recent Friday night when Justin Timberlake arrived at the back entrance with Jessica Biel, prompting cocktail waitresses to run to the window for a look while a rush of clubbers tried to cram their way up a flight of stairs to the roof where the couple was headed. Then came a stream of other famous club kids pushing through, also eager to get in on the action: Lauren Conrad and Lo Bosworth, Nick Lachey and Vanessa Minnillo, Kristen Cavallari, a Wayans brother, even Benjamin McKenzie of "The O.C." The basement was no less thrilling. Even though there weren't any celebs down here, people seemed hot on the art deco-style venue, which used to house Frederick's of Hollywood, not to mention the go-go dancers clad in—you guessed it—Frederick's lingerie.