Photo SpecialStar Hair: Get the Look!

What Not to Wear's hair guru Nick Arrojo tells you how to style your tresses like Jessica, Sienna and eight other celebs. By Serena Kappes

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SIENNA MILLER

How to get the look:
1. Use a volumizing product to blow-dry and tousle hair with fingers.
2. In the jar, blow-dry a small amount of pomade until it liquefies. Dab onto palm and apply "to create separation and texture," says Arrojo.
3. For a "more carefree look," use a curling iron to loosely loop the ends.

Bonus tip: "Add extensions to give your hair pieces of length in areas," he says.

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