Is Kim Kardashian experiencing her own American horror story?Surfwin

The Kardashians star did a double take after noticing an eerie shadow in the background of one of her recent selfies.

"Soooo I took this pic last week when I was alone," Kim explained in a July 9 Instagram post, "and now going through my phone I am freaking out noticing a woman in the window."

Fans quickly took to the comments to weigh in. Some offered an explanation. "It's just your reflection," one commenter wrote. Added another, "Your shadow from the sun." Others provided supernatural suggestions. "Looks like an alien!!" chimed in a follower. Guessed another, "Omg it's a ghost!!!!!" 

And some social media users took a page from the Kardashians' book. "This is a case for the FBI," one wrote while quoting Kim's mom Kris Jenner. Referencing Scott Disick's famous prank, another commented, "Hi Kim! It's only me, it's Todd Kraines!"

While this answer remains a mystery, one thing is for sure: It's good prep for Kim's latest role, given that she's starring in season 12 of American Horror Story with Emma Roberts.

"Kim is among the biggest and brightest television stars in the world and we are thrilled to welcome her to the AHS family," the show's co-creator RyanMurphy told The Hollywood Reporter in April. "Emma and I are excited about collaborating with this true force in the culture. Halley Feiffer has written a fun, stylish and ultimately terrifying role especially for Kim, and this season is ambitious and unlike anything we have ever done."

And even though this is a new experience for Kim, she isn't afraid to give it a go.

"It's really fun to step outside of your comfort zone and try something new and grow. I'm so excited for the experience," the SKIMS mogul told Variety at the Met Gala in May before being asked if she's taking acting lessons, "I am, of course. It's a challenge. I like to challenge myself."

Get updates on your favorite family & more. Sign up for Kards Katch Up with E! News!