By Brittany Talarico
Updated October 09, 2015 10:32 PM
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Allison Williams’ custom Oscar de la Renta wedding dress had a lot of intricate details (like embroidered thread work and 3D organza flowers). But when it came to choosing her wedding ring, the Girls star went for something classic and simple.

Allison Williams wedding band


Allan Bregg/Splash News Online; Inset: Allan Bregg

Williams was snapped wearing her ring — a sleek diamond eternity band — while walking her dog in N.Y.C. Friday. It looks like she turned her round diamond engagement ring around, just flashing the platinum band next to her new bling. The actress also had the perfect red fall mani.

Williams tied the knot with College Humor co-founder Ricky Van Veen in rustic ceremony in Saratoga, Wyoming, on September 19. The star wore an elegant, long sleeve Oscar de la Renta couture dress for the ceremony at Brush Creek Ranch.

The tulle base, satin silk ballgown silhouette featured a high illusion neckline and as well as pastel degradé hand embroidered thread work and 3D organza flowers. She completed her regal bridal look with a floor-length veil and custom Brian Atwood heels.

Among the 150-200 guests at the wedding were her Girls Lena Dunham, Jemima Kirke and Zosia Mamet — with a source telling PEOPLE that Tom Hanks officiated and Brian Williams walked his daughter down the aisle.

Williams recently posted a snap from her “heavenly” Italian honeymoon on Instagram, giving her followers even more FOMO. (As if that was possible.)

RELATED VIDEO: Allison Williams: I Hope I Continue to Be More Comfortable Without Makeup

–Brittany Talarico