As fashion week enters its last few days, the party scene is still going full-steam ahead. This weekend, Bella Hadid hosted a full blow-out to celebrate her collaboration with Chrome Hearts, while sister Gigi popped by the annual CFDA Americans in Paris cocktail party with boyfriend Zayn Malik. It was a surprise celebration, however, that drew out the weekend’s biggest crowd–including fellow former boy-bander turned brooding solo artist, Nick Jonas–as Antoine Arnault threw a secret birthday party for longtime partner Natalia Vodianova on Saturday evening. The party brought out the likes of Sienna Miller, Lottie Moss, and Dior’s Maria Grazia Chiuri, among others, all dressed in shades of red, per the invite’s instructions. Julianne Moore, meanwhile, hosted an intimate dinner party with L’Oreal Paris, drawing out Isabelle Huppert, Liya Kebede, Lewis Hamilton, and Emily Ratajkowski. Also hot spots this weekend: Aquazzura x de Gournay x Matchesfashion.com’s cocktail party and the HEAVENSAKE A Better High awareness performance, held at the American Cathedral. For all of the best party pictures, click through.