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Khloe Kardashian isn't ready to talk to Rob Kardashian.

After the Kardashians learned about Rob and Blac Chyna's engagement online, they didn't take to social media to congratulate the couple and it sounds like they aren't going to anytime soon.

In this clip from Sunday's Keeping Up With the Kardashians, Khloe tells Kim Kardashian, Kourtney Kardashian and Kylie Jenner not to congratulate Rob and Blac Chyna.

"No one should congratulate them," Khloe says. "That's so desperate and fake of whoever does first because I know someone's gonna break."

Kylie then tells her sisters that Tyga tweeted about the engagement.

"Saying what?" Kim asks.

"He said, 'Everyone deserves to be happy. What someone does for their happiness is not my concern, as long as it's not interfering with my happiness,'" Kylie reads.

Blac Chyna, Rob Kardashian, Khloe Kardashian

Greg Doherty/Getty Images

She then tells her sisters that people aren't "bashing" his tweet, they're realizing he doesn't care.

"People are trying to make it this big feud and it's just, it is what it is, like we just want Rob to be happy," Kylie explains. "I just feel like the world thinks that we care so much and they're making it this huge, big deal when in reality none of us really care we just want Rob to be able to tell us when he's gonna do something so big like this."

Take a look at the video above to see the Kardashians talk more about Rob and Blac Chyna's engagement!