Khloé Kardashian made a splash at Michael Rubin’s annual White Party in the Hamptons for the Fourth of July.

The reality star, who turned 40 on June 27, stepped out to the star-studded bash in a white figure-hugging dress with a high neckline and Sєxy cutout details. Her waist-length light brown hair was styled into soft waves and she wore a simple, glowy makeup look.

Khloé attended the Thursday, July 4, gathering alongside her sister Kim Kardashian, who wore a sleek white skirt and matching halter-style top with a plunging neckline. The SKIMS founder accessorized with a large silver cross necklace. The sisters matched in almond-shaped French manicures. Younger sister Kendall Jenner was also in attendance.