The Sexiest, Messiest Celeb Hair

Give your curling iron the night off! A-listers show you how to work the new casual, easy hair.

Shakira

She always knows how to shake things up--including her hairstyle. Here, she's enhanced her natural waves. "Run polish cream or gel through dry hair and braid before going to bed," suggests Oscar Blandi, celeb stylist and owner of New York City's Oscar Blandi Salon. "When you undo it in the morning, gently pull the hair wide apart to keep your waves from coming undone."

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Mary-Kate Olsen

MK's "I really rolled out of bed" style just works. Who knew something so simple could be so chic?

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Nicole Richie

We're kinda glad her escapades on The Simple Life came to an end, but at least she kept her low-key look, roots and all. To get her nicely imperfect updo, pull your hair back into a low messy bun using a drop of gel. Then, says Blandi, tease out a few pieces so it doesn't look too perfect.

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Keira Knightley and Sienna Miller

These Brits give off the same London-cool vibes with their effortless style. Who needs Jude when you and your BFF look this good?

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Beyoncé

What a great pair--um, we're talking about the loose curls she's working and the super-glam dress.

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Kate Bosworth

Kate's chic bob in 21 is nice and all, but we miss her surfer-girl, Blue Crush waves. She must too--she's doing them again!

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Leighton Meester

She may have the Park Avenue Princess blowout down pat on Gossip Girl, but Leighton's relaxed curls off set look more S and less B.

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Kate Beckinsale

The perfect mix of understated sexy and polished glam--the hair, the jewelry, the dress, the whole shebang.

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