Did Rob Kardashian just diss his sister, Kim, on Instagram? In a recent post in the photo-sharing site, Kris Jenner's son compared his sister to Rosamund Pike's lunatic character from the hit 2014 psychological thriller film, "Gone Girl."  

Rob's disturbing social media post seems to suggest an ongoing family feud in the infamous Kardashian clan. According to the Daily Mirror, Rob and Kim have strained their relationship after he flew back home before his sister's wedding to Kanye West in Italy. Since then, the 28-year-old reality star has remained out of the public's eyes.

Rob's controversial snap of "Gone Girl's" Amy Dunne was posted earlier today on his Instagram page. It shows the scene where Dunne was covered in blood as she returned to her husband.

"This is my sister Kim, the b**ch from Gone Girl..." the "Dancing with the Stars" Season 13 alum captioned his social media post.

Though it looks like there could be some bad blood between the Kardashian siblings, Kim hasn't made any comments yet. Instead, she posted an adorable photo of her husband Kanye and daughter North playing together as they spent the day at the beach.  

"Beach Day #AllDay," she wrote on Instagram.

Meanwhile, Rob's other sister, Khloe, recently claimed that his brother has social anxiety, Ace Showbiz revealed.

"Rob has become very introverted and has a kind of social anxiety," Khloe said. "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. It's a growing process. I will always be his No. 1 supporter."

Rob has since un-followed his entire family on Instagram, TMZ has learned. And in June 2014, it was also announced that Rob wanted nothing more to do with the E! reality TV show, "Keeping Up with the Kardashians." 

The Daily Mail reported that the people behind the show, which made their entire family famous, decided that Rob would no longer receive an ongoing storyline in the reality series. 

There is no explanation on what prompted Rob Kardashian to post the odd message as of late. And there was no hint as to whether he intended the post to be a joke.