Portman dazzles in Lanvin at the L.A. premiere of The Darjeeling Limited. Plus: Britney, Jessica Simpson, Janet Jackson and more

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JACKSON THREE

Janet Jackson parties with her nearest and dearest fan club – her brothers Tito (left) and Jermaine (right) – Thursday at Boulevard 3 following the Hollywood premiere of her new film, Tyler Perry's Why Did I Get Married?. At the event, the svelte singer revealed she plans to write about her struggles with weight, telling PEOPLE, "[I'm] really coming from the soul."