Tilda Swinton (in her pal Haider Ackermann ... with such stars as Greta Lee (floral in Loewe), Anna Sawai (poufed in Louis Vuitton) and Zoe Saldaña (so stunning in Harris Reed) looking drop ...

Celebrities packed into a suite at the Chateau Marmont in Los Angeles for the W Magazine party on Saturday night.

How Tilda Swinton, Kieran Culkin and other stars spent their night. (Hint: There was an all-you-can-eat sushi buffet.) ...

Emerging style star Mikey Madison wore Mathieu Blazy’s final red carpet look for Bottega Veneta ahead of his move to Chanel.