Kim Kardashian News: 'Keeping Up With the Kardashians' Star Compared to Amy Dunne From 'Gone Girl'

Rob Kardashian must have been harboring a very deep grudge against his sister Kim Kardashian-West when he compared her to the character of Amy Dunne in the movie "Gone Girl."

In an Instagram post on Sunday, Rob captioned a photo showing Rosamund Pike – who was returning to her husband covered in blood after killing her ex with a razor – as his sister.

"This is my sister kim , the b**** from Gone Girl," he wrote in a post for his 2.7 million followers to see, according to Page Six.

The former socks entrepreneur also wiped out his previous posts, unfollowing his entire family on Instagram only to refollow them again a few hours after, the Daily News reported.

The bloodied photo of Pike in a scene for the movie adaptation of "Gone Girl" is Rob's only post on Instagram post so far, Page Six confirmed.

But the tabloid hast yet to confirm whether Rob was taking a serious swipe at Kim, or if his feed was hacked. None of Kardashians' representatives have issued a statement yet.

His post was the complete opposite of the heart-warming birthday message that Kim posted on Instagram for her brother's 28th birthday on Tuesday.

"I love you so much and can't wait to share so many more memories with you!" she wrote, according to Daily News.

Rob and Kim have had a history of problems in the past with Rob storming out of Kim's wedding to Kanye West in 2014.

In a separate interview, Khloe Kardashian revealed that her brother has been going through some personal problems, Page Six reported.

"Rob has become very introverted and has a new kind of social anxiety. He's definitely not at his happiest place that he once was, and I know he can get to that happy place and he will," she said.