Pippa Middleton, The Duchess of Cambridge, Olivia Palermo, and more celebrity hair looks we love this week

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Every week, we round up the best of the best in celebrity hair looks.

From sleek and sophisticated to laid-back and casual, here are four styles from this week's red carpets (and sidewalks) that knocked it out of the park.

Click through the gallery to see all of this week's best celebrity hair looks.

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