OMG! Rob Kardashian seems to be at war with Kim Kardashian-West after he reportedly blasted his sister on Instagram. In a recent post in the photo-sharing site, the youngest Kardashian sibling compared his sister to the mad character portrayed by actress Rosamund Pike in the 2014 psychological thriller flick, "Gone Girl." 

Through a troubling social media post, Rob Kardashian appears to suggest an ongoing family feud in the infamous Kardashian clan. The dispute has strained their relationship between Rob and Kim, Daily Mirror reported. The alleged feud started after he flew back home before his sister's Italian wedding to Kanye West. Since then, the 28-year-old reality star has stayed out of the public's interests.

Earlier Sunday, Rob Kardashian posted a contentious photo of "Gone Girl's" Amy Dunne on his official Instagram page. The controversial snap shared by Kris Jenner's son depicts 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.

Although it appears like there could be some bitterness of feelings between the Kardashian siblings, Kim remained mum about the issue. And instead of reacting, the 34-year-old mom-of-one channeled some good vibes in sharing an adorable image of her husband Kanye and daughter North. In Kim's post, the father and daughter were seen bonding together as they play and spent the day at the beach. 

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

Meanwhile, Ace Showbiz revealed that Khloe Kardashian recently claimed that his brother, Rob, was having a social anxiety.

"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."

According to TMZ, Rob Kardashian has since un-followed his entire family on Instagram. And it was also announced June of last year that Rob wanted nothing more to do with his family's TV show, "Keeping Up with the Kardashians," which airs on E!.  

The people behind the show, which made their entire family famous, decided that Rob Kardashian would no longer be a part of an ongoing plotline in the series. Since then, the Daily Mail shared Rob has been hardly seen in public.

So far, there are still no clues as to whether or not Rob Kardashian intended the photo to be a joke. There are no further details as well on why the youngest Kardashian sibling posted the disturbing message.