Rihanna
Rihanna stepped out in support of her partner A$AP Rocky, and the two looked cute bundled up together as they arrived at the party and exited together.
Rihanna has been supporting A$AP all week long amid promo for his new album, including an appearance at his album release party.
Click through to see the full guest list…
Photos: Backgrid Posted to: ASAP Rocky, Charlie Heaton, Finn Wolfhard, Gaten Matarazzo, Joe Keery, Marcello Hernandez, Matt Duffer, Natalia Dyer, Rihanna, Ross Duffer, Sabrina Carpenter, Saturday Night Live, Slideshow, The Duffer Brothers