A lick of red lipstick and cat-eye sunnies were all that was needed to finish the 21-year-old's nostalgia-inducing look.
But the biggest accessory of them all? On her arm stood Disick dressed in a t-shirt and red swim shorts - a sartorial tribute to the plastic hunk.
Proving he's entirely dedicated to All Hallow's Eve, the father-of-three even bleached his hair the perfect shade of Ken.
Though his commitment to October 31 isn't entirely surprising, as a love for the season runs in the family.
Getting into the spirits of things, Disick and Kourtney Kardashian's daughter Penelope took on the role of a angel-turned-devil.
Ready to go trick or treating with cousin North West, the seven-year-old dressed in an adorable feathered dress with mismatched boots - two spring/summer trends tackled in one fell swoop.
Meanwhile, her mum donned a space cowboy get-up for sister Kendall's star-studded 24th birthday bash in a fringed hat, metallic hot pants and western boots.
With Halloween now behind us, we've got exactly 362 days to come up with a better costume than our go-to cat ears...