Summer's Hottest Hats

Not just for bad hair days, the toppers Jessica Alba, Ashlee Simpson and more wear keep them looking and feeling cool

ASHLEE SIMPSON

Why we love it: Ashlee's $92 Hat Attack raffia crusher has a charming My Fair Lady vibe to it.
Where we'd wear it: A girls-only picnic in the park (this hat is not exactly what we'd call guy-hot), with a floral sundress