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Kim Kardashian mistakenly shows up to Tracee Ellis Ross’ party in costume

Maybe she just Skimmed the invitation.

Kim Kardashian showed up to Tracee Ellis Ross’ pre-Halloween birthday dinner dressed as “X-Men” character Mystique — only to find out no one else was in costume.

“That time I showed up to a birthday dinner in full costume when it wasn’t a costume party!” the “Kardashians” star captioned a selfie with the “Black-ish” alum on her Instagram Story on Sunday.

The photo showed Kardashian wearing a red wig, creepy colored contact lenses and a skintight blue latex bodysuit. While the Skims founder looked unrecognizable, apart from her famous curves being on display, Ross was unmistakably herself, wearing a red sequined jumpsuit with a matching jacket.

Kim Kardashian mistakenly showed up to Tracee Ellis Ross’ birthday dinner in costume over Halloween weekend. kimkardashian/Instagram

“Happy Birthday to the most beautiful kind soul @traceellisross,” Kardashian, 42, added in her tribute to the actress, who turned 50 on Saturday.

The reality star was most likely still in costume from her other Halloween festivities with her family.

Kardashian called Ross “the most beautiful kind soul.” NBCUniversal/NBCU Photo Bank via

She shared several videos of the spooky celebration that showed her home decorated with fake spiderwebs and her yard transformed into a graveyard. There were also actors dressed up as mummies and lots of sweet treats to enjoy.

Later in the evening, Kardashian attended a Halloween party at Tao LA where she hung out with Sean “Diddy” Combs.

Ross celebrated her 50th birthday on Saturday. GC Images

The rapper, 52, was dressed as a very scary-looking Joker from “Batman,” wearing a slicked-back green hairdo, a purple sports jacket and runny clown makeup.

Kardashian shared a selfie with Diddy to her Instagram Story, writing, “never broke character @Diddy.”

Ross enjoyed a birthday cake at her dinner party with friends. traceeellisross/Instgram

Kardashian’s sisters also got into the Halloween spirit over the weekend and went all out with their costumes.

Kourtney Kardashian and her husband, Travis Barker, dressed as Chucky and Tiffany, respectively, from the “Child’s Play” franchise.

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Kim Kardashian dressed as Mystique.
The Skims founder dressed as “X-Men” character Mystique.
Kim Kardashian dressed as Mystique.
The Skims founder dressed as “X-Men” character Mystique.kimkardashian/Instagram
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Kim Kardashian dressed as Mystique.
The Skims founder dressed as “X-Men” character Mystique.kimkardashian/Instagram
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Kendall Jenner, meanwhile, transformed into a sexy version of Jessie from “Toy Story” by wearing a red cowgirl hat, braided pigtails, micro jean shorts and cowhide-print chaps.

Kylie Jenner channeled the bride of Frankenstein in a dress designed by Jean Paul Gaultier for a Kylie Cosmetics shoot. She also went as Elvira, wearing a spiderweb bikini top with nipple tassels and a very poofy wig.

Khloé Kardashian dressed as a cat, and in a spine-chilling turn of events, she welcomed her cheater ex Tristan Thompson to the family’s Halloween party. The former couple share 4-year-old daughter True and welcomed a son via surrogate in July.