From Brad Pitt to Rachel Bilson, certain celebrities never shy away from giving their outfit that little something extra -- a hat! Headgear is in, it doesn't matter whether your head is cold or not.

A hat can really make a statement when worn correctly. A slouchy beanie says you're anti-establishment while a beret shows that you're chic and cute and possibly Parisian.

Browse through the gallery to see a few celebrity hat looks and find out where you can get their style!