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Duff makes sure her pal doesn't breathe a word. Plus: Christina Aguilera, Charlize Theron and more

ALL SHUSHED UP  photo | Hilary Duff

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ALL SHUSHED UP

Hilary Duff catches a case of the giggles as she keeps her friend quiet on a shopping outing Thursday in Beverly Hills.

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Credit: Ramey

Published: Friday Sep 14, 2007 | 02:15 PM EDT

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