Hilary Duff: Fiji Water Days of Summer Host

Hilary Duff keeps hydrated at the Fiji Water Days of Summer Event on Saturday (July 20) at The Estate in Sag Harbor, NY.

The 25-year-old actress, who served as the host of the day, was joined by her BFF Lauren Bannock.

PHOTOS: Check out the latest pics of Hilary Duff

“Just got to NY! So excited Hamptons girls weekend w/ @FIJIWater! I’ve never been here it’s so gorgeous!” Hilary tweeted the night before.

“keeping hydrated in the Hamptons with @fijiwater!” she added from the party, along with a pic.

FYI: Hilary is wearing a Jen Kao dress, Julia Cohen necklace, and a Stephen Dweck ring.

20+ pictures inside of Hilary Duff having fun at the Fiji Water event…