The Kardashians weren't given a heads up on Rob Kardashian's engagement to Blac Chyna.

On next Sunday's Keeping Up With the Kardashians, the family learns about Rob's engagement online!

In this promo clip, Kim Kardashian, Khloe Kardashian and Kourtney Kardashian are getting ready when they find out their brother is getting married.

"We wake up to all of these pictures of my brother getting engaged," Kim explains.

And while the Kardashians were left out of the engagement, it sounds like Blac Chyna's family was there when the proposal took place.

"He proposed in front of her whole family," Khloe says.

"How does our own brother not tell us?!" Kim asks.


Take a look at the clip above to see a sneak peek of next Sunday's episode!

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