Kim Kardashian and Khloe Kardashian -- all history and drama aside -- are giving props to Blac Chyna for resurrecting their previously depressed and unhealthy little brother Rob Kardashian.

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In a preview clip E! released for the Sunday, May 15 episode of Keeping Up with the Kardashians, the girls give some credit where credit is due.

"Question," Khloe, 31, tells Kim in the video clip. "Like, don't we kind of think it's a miracle that Rob -- who doesn't even show up to Christmas for the past three years, literally he wouldn't leave his room -- but the fact that now he's created a Snapchat, the fact that now he wants to be so public, blows my mind."

Agreeing that Chyna motivated Rob and improved his quality of life since they began dating in January, Kim adds, "She gave him confidence, more power to her."

"After Rob and Blac Chyna started dating, Rob is now, like, all over social media and, like, out and about," Kim, 35, tells the cameras in a confessional. "He hasn't been like this in so long that, even though there's been some drama, if this is what it takes, then I don't care who he's dating. I'm just so happy that he's feeling better about himself."

According to multiple reports, Rob lost about 70 pounds thanks to Chyna and clearly feels comfortable in his own skin again.

"If some p-ssy is getting him to remove his braces and shave his beard and work out...," Khloe quips in the promo clip.

"My thing is," Kim interjects, "Do what you want, do what makes you happy, whatever. But he should have said to us, 'Hey guys, this is how I feel, I can't help who I love and I fell in love with her, but [Kylie Jenner] should know this.'"

Drama derived from the fact Chyna was previously engaged to Tyga, the father of her three-year-old son King Cairo who -- at least as of last week -- was dating Jenner.

In the video, Khloe nods her head in full agreement with Kim, and then the two women both insist Rob has "no loyalty."

Khloe was initially hurt Rob let his relationship with Chyna get in the way of the solid bond they had developed living together.

"Am I disappointed that Rob isn't talking to me after he got out of my house? Yeah, because I've been the only one that stood by him and defended him and wanted the best for him. So that's just where it gets frustrating," Khloe says in a confessional.

However, as of lately, Rob, 29, and Chyna, 28, have publicly reconciled with the Kardashian sisters. The couple is also now engaged and expecting their first child together.
About The Author: Elizabeth Kwiatkowski
Elizabeth Kwiatkowski is Associate Editor of Reality TV World and has been covering the reality TV genre for more than a decade.