In an explosive new trailer clip for the upcoming 12th season of

READ: Momager, family believe Rob Kardashian's engagement is a "mistake"

The explosive clip, shows Kim Kardashian fuming at her brother for his choice in a romantic partner, while Khloe Kardashian describes their sudden engagement as 'f**ked up'.

The 35-year-old model calls Rob while Kylie Jenner looks on, delivering a very clear warning:

"You make sure your girlfriend doesn't publicly bash your sisters!" she screams.

Khloe also speaks on her confusion over seeing formerly reclusive Rob, back in the spotlight after revealing his relationship with Chyna.

"The fact that now he wants to be so public blows my mind." the 31-year-old tells someone off-camera.

Meanwhile, Rob was quick to warn his sisters to back off if they were not willing to support his first proposal ever.

"Listen to the hostility in your voice, that's exactly why I don't say anything," Rob says to Kim, Kourtney and Khloe.

"This is the first time I ever proposed to someone in my life, don't come at me with some bulls***."

Rob also made sure to clear up on the rumours that he has also proposed to exes, Adrienne Bailon and Rita Ora.

Of course, the Kardashians are back to being one big happy family, as Rob is set to make a return to KUWTK, and they begin to warm up to Blac.

READ: Reality star says his family is 'very happy' with engagement to Blac Chyna

Watch trailer below: