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Rob Kardashian, Kim Kardashian

Jason LaVeris/Getty Images

Where's the love, Kardashians?

Rob Kardashian may not be a social media addict like his sisters. But whenever he heads to Instagram to post, fans can't help but pay attention.

Well, on Sunday afternoon, the Keeping Up With the Kardashians star gave viewers a giant reason to talk when he posted a cryptic message directed towards Kim Kardashian.

"This is my sister Kim," he wrote with an image of Rosamund Pike covered in blood on the big screen. "The bitch from Gone Girl." 

If that wasn't mysterious enough, Rob deleted all of his recent posts and now only follows 10 people. And yes dolls, Kim and all of his sisters luckily made the list along with Scott Disick and French Montana.

The buzzworthy post comes just a few short days after the man behind Arthur George socks received plenty of support from his family in honor of his 28th birthday.

Kim shared a throwback picture from when the duo was all smiles in Las Vegas. "Happy Birthday to my one and only brother Robbie!!!!" she wrote online. "I love you so much and can't wait to share so many more memories with you!"

But perhaps it was sister Khloe Kardashian that had the sweetest (and most revealing) message of all.

"Never will I ever meet another man as great as you! I know this is the year where you will find your happiness again!" Khloé wrote while sharing her support for her younger sibling. "I will be right by your side, holding your hand, every step of the way!!! I adore you my one and only brother!!"

Could Rob's latest post be all in good fun, or is it something more? Guess we'll just have to stay tuned and keep up!

New episodes of Keeping Up With the Kardashians air Sunday nights at 9 p.m. only on E!