Star 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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JESSICA ALBA

How to get the look:
1. Apply volumizing mousse all over, and – using a medium-sized round barrel brush – blow-dry smooth.
2. Wrap hair sections around the brush, and blow-dry for five seconds. Blast with cool air to set and unravel.
3. Twist the pieces together to "create loopy, bouncy waves," says Arrojo.

Bonus tip: You can also use hot Velcro rollers – but be sure to cool hair before removing them. "Otherwise, you'll lose the bounce," he says. Finish with hairspray.