When Paris Hilton said, “I love my Sidekick!” on Tuesday night, she obviously wasn’t talking about Nicole Richie (although the ex-B.F.F.s reportedly arrived at the pink carpet at the same time). She was referring to her new T-Mobile gadget, which made its debut at a party that would have done any debutante proud. Or, rather, any grade schooler—the bash had a distinctly playful feel. The Hollywood Palladium was transformed into a fantasy playground for the event, with topiaries and real grass and trees. Guests played carnival games (prizes were street fair-issue stuffed animals) and mugged inside a photo booth (both Paris Hilton and Mischa Barton posed with friends). There were two circular seating areas; Jessica Simpson and Eva Longoria held court at one of them, while Nicole Richie and Mischa Barton commandeered the other. And let’s not forget the device that brought everyone together: the Sidekick 3. Stars mesmerized by the gadget were left wanting: unlike at an A-list kid’s birthday party, there were no electronics-stuffed goody bags.

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