Rob Kardashian, Kim Kardashian

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When it comes to their brother Rob Kardashian's new romance with Blac Chyna, the Kardashian and Jenner sisters are not offering their seals of approval. 

Just days after it was confirmed that the 28-year-old reality show star had sparked a surprise romance with the 27-year-old model, Kim Kardashian, Kylie Jenner and the rest of the family's sisters are already fuming over the pairing. 

The "sisters are livid about their relationship and not supportive of it at all," one source shared with E! News.  

It's not like the budding romance got off to such a great start. Chyna was previously engaged to and has a son with Tyga, Kylie's on-and-off boyfriend. This can understandably cause some tension, particularly since the ladies have been throwing shade at each other for months already. According to a second insider, Kylie has elected to turn a blind eye to the twosome and continues to ignore it all together.  

"All the sisters are united and think Rob is being disloyal," a second source close to the family revealed to E! News. "They want him to be happy, but they're just so over the whole thing."

Kylie Jenner, Rob Kardashian, Blac Chyna

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Big sister Kim feels no differently. According to the second insider, Kim does not condone the relationship and is at the point where "she doesn't even care."

While the women are less than thrilled, Rob's new lady appears to have quite the positive effect on the reclusive star, who has been battling a diabetes diagnosis for months. To start, she's gotten him back in the gym. 

In a rare photo of the private celebrity, Rob revealed himself lifting weights Thursday. Whether his new fitness boost is to impress his new lady or simply regain control of his health, Chyna's presence in his life may be just the encouragement he needs to overcome his longstanding personal obstacles. 

Meanwhile, despite reports to the contrary, mom Kris Jenner did not visit Chyna's house today.

"Kris' friend's family lives there in the same community and Rob met her at their house," another insider shared with E! News. "Chyna is in Europe anyway. Everyone needs to do their homework."

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