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On Saturday, celebrities including Gayle King, Rachel Zoe and Neil Patrick Harris flocked to the Hamptons to celebrate Louis Vuitton. The French fashion house hosted a garden party after unveiling its new East Hampton boutique last summer.

Ahead, see the best looks from the fashionable daytime bash.

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Gayle King

Gayle King at the Louis Vuitton Hamptons Garden Party on July 20 in the Hamptons, New York.

Gayle King at the Louis Vuitton Hamptons Garden Party on July 20 in the Hamptons, New York. John Nacion for WWD

King paired a blue patterned off-the-shoulder dress by Dianve von Furstenberg with matching flip-flops, a silver cuff bracelet and a tweed iteration of Louis Vuitton’s Capucines handbag.

Neil Patrick Harris and David Burtka

Neil Patrick Harris and David Burtka at the Louis Vuitton Hamptons Garden Party on July 20 in the Hamptons, New York.

Neil Patrick Harris and David Burtka at the Louis Vuitton Hamptons Garden Party on July 20 in the Hamptons, New York. John Nacion for WWD

Harris and his husband, David Burtka, embraced preppy flairs in polo shirts and shorts. The “How I Met Your Mother Star” accessorized his white and navy ensemble with a pair of sleek white sneakers, while Burtka wore a green Louis Vuitton top with pleated khaki shorts and black and white loafers.

Rachel Zoe

Rachel Zoe at the Louis Vuitton Hamptons Garden Party on July 20 in the Hamptons, New York.

Rachel Zoe at the Louis Vuitton Hamptons Garden Party on July 20 in the Hamptons, New York. John Nacion for WWD

Zoe opted for an all-black ensemble consisting of a high-neck top and midi skirt featuring a ruffled hem. The stylist accessorized with a gold necklace, round frames and peep-toe platforms.

Princess Maria-Olympia of Greece and Denmark

Princess Maria-Olympia of Greece and Denmark at the Louis Vuitton Hamptons Garden Party on July 20 in the Hamptons, New York.

Princess Maria-Olympia of Greece and Denmark at the Louis Vuitton Hamptons Garden Party on July 20 in the Hamptons, New York. John Nacion for WWD

Princess Maria-Olympia of Greece and Denmark selected a gray Louis Vuitton minidress featuring a zigzag pattern, a flared skirt and a sweetheart neckline. The royal completed her look with a pair of flat black sandals.

Princess Marie-Chantal of Greece

Princess Marie-Chantal of Greece at the Louis Vuitton Hamptons Garden Party on July 20 in the Hamptons, New York.

Princess Marie-Chantal of Greece at the Louis Vuitton Hamptons Garden Party on July 20 in the Hamptons, New York. John Nacion for WWD

Princess Maria-Olympia’s mother, Princess Marie-Chantal of Greece, opted for a blue-violet smocked maxidress featuring a tiered skirt and ruffled trim. She accessorized with matching sandals, a gold medallion and a miniature Speedy handbag made of raffia.