Who is Rob Kardashian’s #WCW? That would be his big sister Khloe Kardashian! The reality TV star tweeted out a picture of his sis wearing super tight workout clothes on the way to the gym with the caption, “#WCW @khloekardashian shneeeeee meeeee claaaaaa.”

Of course, his sister Khloe took to social media to respond to his Twitter pic. She grabbed a screenshot of Rob’s tweet, posted it on Instagram, and captioned it, “Totally a normal brother/sister relationship. Incest is best!!! #HeyBooHey.”

PHOTOS: 10 Pictures of Khloe Kardashian Getting Fit

While both of the Kardashian sibs were clearly joking around, there is no denying their close brother/sister bond. As documented on Keeping Up With the Kardashians and Khloe’s spinoff with her ex-husband Lamar Odom, Rob actually lived with Khloe and basically became BFFs with Lamar.

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What do you think about Khloe and Rob’s relationship? Do hope to see Rob back on Keeping Up With the Kardashians? Tweet @OKMagazine and leave a comment below.

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