The reality TV star stepped up the glamour in red, opting for a plunging satin ball gown and scarlet lips to match.
Kim took to Twitter to give her fans a glimpse of her sexy look. "Sneak peek Oscar party glam Dress- Celia Kritharioti. Jewels-Lorraine Shwartz," she wrote alongside a selfie.
Also wearing red was Kim's younger sister Khloe, who sported a velvet wrap gown and a deep berry lip.
They attended the annual party with older sister Kourtney. The pretty brunette was channelling androgynous chic in a black tuxedo and white shirt with a pussybow tie.
The girls' mother Kris, meanwhile, looked just as glamorous in a dramatic black lace dress.
At the star-studded bash, the Kardashian clan rubbed shoulders with fellow famous faces Heidi Klum, Britney Spears and Karolina Kurkova.
Heidi showed off her supermodel physique in a black, sequinned and embellished strapless gown with a fishtail hemline.
Britney rocked a daring dress with a deep v-neckline and sheer panels. A black choker-style necklace added a gothic edge to the look.
Supermodel Karolina was an angelic vision in a white lace dress with sheer panels. Bright red lipstick added a splash of colour to her outfit while slicked-back hair topped off the elegant look.