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Adrienne Bailon

NEW YORK, NY - JANUARY 28: Actress/singer Adrienne Bailon attends the Adrienne Bailon Valentine's Day Cocktail Recipe Unveiling at Provacateur on January 28, 2013 in New York City. (Photo by Ilya S. Savenok/Getty Images)

What Were They Thinking?!

This week's worst-dressed crew includes Lindsay Lohan, Rose Byrne, and Christina Applegate. -- By Matt Whitfield