The 27-year-old actress donned a sleeveless white crop top along with a black and white sweater and matching short skirt.
The Twilight star completed her outfit with white stockings and pointy black shoes.
Stella, 27, also wore a white crop top along with a black leather jacket and tight black leather trousers.
The Victoria's Secret model completed her ensemble with black heels.
Kristen accentuated her natural Beauty with smoky eye makeup and deep red lipstick.
Stella meanwhile opted for light eye makeup and pink lipstick.
Top model: Stella Maxwell wore a black and white outfit jut like girlfriend Kristen
Twilight star: Kristen added a pop of color with deep red lipstick
Black and white: The 27-year-old actress wore a white crop top along with a black and white sweater and matching skirt
Fan favorite: Kristen rose to fame with the Twilight saga
Leather outfit: Stella stunned in a black leather jacket and matching skinny pants
Crop top: The Victoria's Secret model showed her flat tummy in a crop top
Kristen and Stella, who have been dating since late 2016, were among the stars at the celebrity-studded opening party for the Chanel Beauty House.
The experiential pop-up will be open for free from Thursday through Sunday for those who reserve a space.
The Chanel Beauty House celebrates the newly launched @welovecoco Instagram account dedicated to user-generated content incorporating Chanel products.
Angel wings: The blonde Beauty became a Victoria's Secret Angel in 2015
Thor star: Tessa Thompson also wore a black and white outfit to the party
Olympics champion: Chloe Kim was at the party after winning gold in snowboarding at the 2018 Winter Olympics
Feeling blue: Billie Lourd wore a light