Panama Hats

Although Winter has just begun, our favorite fashionable celebs have been vacationing at some of the most beautiful beaches and donning some seriously chic warm-weather looks. Julianne Hough worked a breezy island-ready combo while shopping in St. Barts, Jessica Alba sported a punchy Isabel Marant tunic with a panama hat in Cabo, and Michelle Williams topped her black bandeau bikini with a chambray shirt and classic shades in Mexico. If you're heading to a tropical destination or just getting a jump-start on planning your Summer adventures, be sure to mimic these two celeb-approved resort looks.

Whether you're trying to combat a bad hair day or just looking to add extra pizzazz to your everyday ensembles, look no further than these 10 celeb-approved hats. We love the way Gwen Stefani took her edgy leather look to new heights via a plaid newsboy cap, how Hilary Duff accessorized her travel style with a two-toned Rag & Bone topper, and how Reese Witherspoon got cozy in a blue striped beanie. From fedoras and fisherman caps to beanies and buckets, cruise through to see which other stars have been wearing hats, then add a few, including exact items, to your Fall mix.

Katy Perry and John Mayer had a day-and-night date in NYC, and for the special outings, Katy wore two equally chic looks that are easy to re-create. During the day, the singer styled this sweater-sleeved Free People denim jacket ($198) with neutral basics and a black Panama hat. Then at night, she channeled her inner glamour girl, working a floral sheath dress with yellow Charlotte Olympia ankle-strap pumps and a yellow chain-strap bag. Get a closer look at Katy's NYC styles, then shop her looks for yourself.