They dressed up as Victoria's Secret Angels with their other three sisters for Halloween earlier in the week.
But Kim and Kourtney Kardashian opted for a one-on-one sister date on Saturday night.
Attending the LACMA Art + Film Gala presented by Gucci, the 38 and 39-year-olds were a vision in the black ensembles.
Sister date: Kim and Kourtney Kardashian showcased their enviable gym-honed physiques at the LACMA Arts + Film Gala on Saturday night in Los Angeles
Kim was showcased her ample cleavage and enviable hourglass physique in a Tom Ford gown for the evening event.
The satin design was perfectly hugged her curves and featured a longer pleated design on one side.
She teamed the look with open-toed heels and accessorized with a cross choker and a carry bag of the same color.
Beauty: Kim was showcased her ample cleavage and enviable hourglass physique in a Tom Ford gown for the evening event
Gorgeous: The satin design was perfectly hugged her curves and featured a longer pleated design on one side
Special night: Kim added extensions to her dark locks for the Gala
Kim added extensions to her dark locks for the Gala.
Her tresses were styled into loose waves and effortlessly flowed over her shoulders with a center path.
The KKW Beauty entrepreneur kept her glam dramatic with a darkly lined eye and heavy lash extensions.
Chic: She teamed the look with open-toed heels and accessorised with a Cross choker and a carry bag of the same color
An angel: Her tresses were styled into loose waves and effortlessly flowed over her shoulders with a center path
Model: Kim ensured all eyes were on her hourglass physique on Saturday night
Getting her makeup done by sister Kylie Jenner's artist, Ariel, he finished the look with subtly contoured cheeks, a bold brow and overlined nude matte lip.
Sister Kourtney also put on a head-turning and jaw-dropping display.
The eldest Kardashian opted for a straight cut halter neck that gave a modest glimpse of her surgically enhanced breasts.
Glam: Getting her makeup done by sister Kylie Jenner's artist, Ariel, he finished the look with subtly contoured cheeks, a bold brow and overlined nude matte lip
Wow! Sister Kourtney also put on a head-turning and jaw-dropping display
Peek-a-boo! The eldest Kardashian opted for a straight cut halter neck that gave a modest glimpse of her surgically enhanced breasts
Hot mama: Her floor length dress featured a sexy open back and hugged her gym-honed physique
Her floor length dress featured a sexy open back and hugged her gym-honed physique.
Kourtney kept her accessories minimal with a handheld clutch and a pair of stud earrings.
The mom-of-three styled her dark Armenian tresses straight and into a half-up half-down style.
Alone time: The sisters spent the night together in Los Angeles, despite the fact that it was sister Kendall Jenner's birthday
Less is more: Kourtney kept her accessories minimal with a handheld clutch and a pair of stud earrings
Covergirl: Kourtney's glam was kept much more simple with a bronzed and contoured complexion that was complete with a light sweep of blush
Stylish: The mom-of-three styled her dark Armenian tresses straight and into a half-up half-down style
Glamour queen: Kourtney sported a subtle smokey burgundy eye and had a nude semi-matte lip
Kourtney's glam was kept much more simple with a bronzed and contoured complexion that was complete with a light sweep of blush.
She sported a subtle smokey burgundy eye and had a nude semi-matte lip.
Kim and Kourtney both took to social media to share a sneak peak of their ensembles with their fans.
The duo are at LACMA in Los Angeles to attend the Art + Film Gala, honoring influential American photographer Catherine Opie and Academy Award-winning filmmaker Guillermo del Toro.
Leonardo DiCaprio will be the co-chair the event for the eighth consecutive year.
Sister sister: Kim and Kourtney both took to social media to share a sneak peak of their ensembles with their fans