From Michelle Williams' pretty pixie to Jessica Biel's long, lustrous locks, Us Weekly presents Hollywood's most stylish hairstyles
Best Unintentional Bob: The What to Expect When You're Expecting star told Jay Leno last spring that she "burst into tears" when she realized her stylist had sheared her locks so short. "I felt so vulnerable. For a woman to all of a sudden have no hair . . . oh my God!" Turns out there was no need for tears: Diaz's bob is super-cute!
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