The 31-year-old reality still managed to look rather fetching as she happily posed wearing a witch's hat, complete with strands of green hair.
Kim poured her famous curves into a sheer, low-cut black top which, paired with some plum trousers and a sequinned black jacket.
Fright night: Kim Kardashian, wearing a sheer black top and a witch's hat, prepared for Halloween at the X Factor Pepsi House in Los Angeles today
Surrounded by pumpkins, she hammed it up in her hat and wig, and a silver mask.
In disguise: The reality star also hammed it up in a silver mask
Her outing today comes after Kim and husband Kris Humphries cheered on her brother Rob from the audience at Dancing With The Stars, last night.
Kim drove the couple to the show earlier in the day in her massive white Rolls Royce, in which she was almost dwarfed behind the wheel.
Getting into the spirit: In the heavily cobwebbed kitchen, Kim carved pumpkins, including one for her little nephew Mason
The clan watched the 24-year-old do the the Cha Cha on the arm of partner Cheryl Burke to the Broadway tune 'Walk Like A Man'.
Kim was seen clapping and cheering enthusiastically in the audience, which was full of stars cheering on the celebrities, including David Arquette's ex-wife Courtney Cox.
Fun with friends: The 31-year-old had a laugh with good friend Jonathan Cheban
And she kept tweeting throughout the performance, as well as adding a photo of her and Rob and her with her brother's dance partner Cheryl Burke, asking: 'How stunning does Cheryl look tonight?'
She encouraged the public to vote by tweeting the show phone number and joking that it was Justin Bieber's.
Kim slipped into yet another show-stopping look yesterday.
Romantic gesture: The card that Kim's husband Kris gave to his wife for her birthday has been revealed
The reality star displayed her curves into some skin tight leather trousers.
Split? The magazine is this week reporting that the couple are heading for a split, for more go to www.lifeandstylemag.com
The black tight outfit showed off the star's most famous assets as she tottered along in towering black platform Louboutin heels.
She paired the look with a black cowl-neck top under a black and white blazer.
She is back in Los Angeles after spending several weeks in Manhattan filming the second series of her reality show Kourtney & Kim Take New York.
The star was fresh from celebrating her 31st birthday in Las Vegas this weekend with husband Kris Humphries and her family.
The group descended upon Marquee Nightclub at the Cosmopolitan hotel for the evening.
Meanwhile the card that Kim's husband Kris gave to his wife on her birthday has been revealed.
Kris was spotted buying the sentiment at a Duane Read drugstore in the Big Apple.
He snuck out while Kim went shopping and visited New York City's Museum of Natural History with her nephew Mason, according to Life & Style magazine.
Support: Her outing today comes after Kim went to the Dancing With The Stars studio last night to cheer on her brother Rob
Hell for leather: Kim's black tight outfit showed off the star's most famous assets as she tottered along in towering black platform Louboutin heels
According to onlookers, the NBA basketballer spent 30 minutes choosing the card.
Despite rumours of an impending split, the magazine also reports that Kim and Kris looked happy during Kim's birthday dinner at New York eatery The Darby, last Friday night.
'Kris was being very gentle with Kim, and she looked at him sweetly after he spoke,' an onlooker told the publication.
'They seemed to be having a nice time.'
Cha Cha: Kim and her family watched the 24-year-old do the the Cha Cha on the arm of partner Cheryl Burke to the Broadway tune 'Walk Like A Man'
Encouragement: Kim was seen clapping and cheering enthusiastically in the audience