The reality star comparing sister Kim to Amy Dunne, the murderer in Gone Girl

By Caitlin Keating
March 22, 2015 04:00 PM

Rob Kardashian posted a startling image on Instagram for his 2.7 million followers to see.

The picture, shared on Sunday, was a still of Amy Dunne, the murderer/fake kidnap victim in Gone Girl, covered in blood.

He wrote along with the image, “This is my sister Kim, the bitch from Gone Girl…”

While the account’s photos appear to have been nearly wiped clean (except for the Gone Girl photo), the account appears to be authentic. It is verified through Instagram and is also the handle that is frequently tagged by Kris Jenner and Rob’s sister.

A source close to the Kardashian family tells PEOPLE that the whole thing is “so dumb.”

“He always posts things he thinks are funny and deletes and unfollows people,” the source says.

“He’s so bizarre, he posts and deletes and thinks people aren’t going to notice.”

On Tuesday, Rob’s 28th birthday, his sister Khloé Kardashian posted a photo on her Instagram. She wrote, “I know this is the year where you will find your happiness again!”

Kim also shared birthday wishes for her younger brother on Instagram, writing, “I love you so much and can’t wait to share so many more memories with you!”

In April 2014 Rob Tweeted, “No one will ever understand how much it hurts.”

Reporting by JENNIFER GARCIA

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