The youngest of Kardashian and Kanye West’s kids went all-out for Halloween this year, while Chicago was a little less enthused.

Kim Kardashian’s son Psalm, 4, and daughter Chicago, 5, pose in their Halloween costumes. PHOTO:

KIM KARDASHIAN/INSTAGRAM

Not everyone in Kim Kardashian’s house was getting into the spirit of Halloween this year.

The SKIMS founder, 43, shared photos of her two youngest kids — daughter Chicago, 5, and son Psalm, 4 — in their respective Halloween costumes on Instagram Saturday, and she revealed that one of her children isn’t the biggest fan of the holiday.

Psalm rocked two all-out costumes in the photos Kardashian shared, first as a ninja turtle with his face painted green and a full-body turtle costume, and then as a member of the Los Angeles fire department, with his own personal firetruck as mode of transportation.

Kim Kardashian’s son Psalm, 4, dressed up as a ninja turtle for Halloween.

KIM KARDASHIAN/INSTAGRAM

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Chicago, on the other hand, was less inclined to get into the Halloween spirit. Kardashian’s youngest daughter opted to go as a kitten and a ghost this year — and both costumes were as low-key as possible for the 5-year-old.

For her kitten costume, she wore a pair of sweatpants and a white tank top, fluffy pink kitten ears, a button nose and whiskers painted on her face.

Kim Kardashian’s daughter Chicago, 5, dressed up as a ghost for Halloween.

KIM KARDASHIAN/INSTAGRAM

Chicago’s second costume was a little more thought out — a white dress with a poofy skirt and sheer sleeves, complete with a pair of white cowboy boots. The youngest daughter of Kardashian and ex-husband Kanye West finished the look with some white eyeshadow and glitter on her cheeks.

“The cutest Ninja Turtle and Firemen and a little ghost and kitty who doesn’t like to dress up for Halloween 👻 🤣,” the Kardashians star wrote on Instagram.

Kim Kardashian’s son Psalm, 4, dressed up as a fireman for Halloween this year.

KIM KARDASHIAN/INSTAGRAM

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Kardashian’s other two kids — daughter North, 10, and son Saint, 7 — also went all-out for Halloween this year.

While her older daughter rocked multiple different show-stopping costumes, Saint opted for one killer look as a zombie version of soccer player Neymar Jr.

“Saint as Zombie Neymar Jr.,” she wrote on Instagram as she shared photos of her older son covered in fake blood and wearing a ripped version of Neymar’s Saudi Pro League soccer uniform.

Kim Kardashian’s son Saint, 7, dressed up as a zombie version of soccer player Neymar Jr. for Halloween.

KIM KARDASHIAN/INSTAGRAM

North rocked several looks for Halloween this year, including two that she coordinated with her cousin Penelope Disick: a Princess and the Frog and Princess Peach look, and a group Cheetah Girls costume that got the stamp of approval from one of movie’s stars Adrienne Bailon.

On other nights, the oldest of the Kardashian-West family honored both of her parents individually.

She dressed up as her rapper dad, channeling his 2007 album Graduation with a “Dropout Bear” costume. She later matched her mom as the two recreated Clueless’ Cher and Dionne in coordinating plaid looks.

Her series of costumes came days after she posed for her first-ever magazine cover for i-D and reflected on what is the best thing about being North West: playing basketball, going to Halloween Horror Nights and, well, “everything.”

When asked how she would describe herself, North said, “The Best Ever,” adding that basketball is a “lifestyle” for her, “not a hobby.”

She also shared her future plans to take over her parents’ businesses. “One day I want to own Yeezy and SKIMS, and I want to be a business owner.”