Kardashians Call Rob's Engagement to Blac Chyna 'F**ked Up' in Explosive 'KUWTK' Season 12 Promo

WATCH: The Kardashians React to Rob's Engagement to Blac Chyna, …

Khloè Kardashian Expecting Baby No. 2 With Tristan Thompson

Khloé Kardashian Reacts to Tristan Thompson’s PDA With Mystery W…

Megan Fox Suggests She and Kourtney Kardashian Should Start an O…

Inside Kim Kardashian and Pete Davidson's Breakup: What Went Wro…

Kim Kardashian Not Ready to Start a Family With Pete Davidson Ye…

Pete Davidson Seeking Trauma Therapy Due to Kanye West's Public …

North West and Penelope Disick Go Ziplining With Kourtney Kardas…

Kendall Jenner Gives Rare Look at Getaway With Devin Booker

Khloè Kardashian & Tristan Thompson Expecting Baby No. 2 | ET's …

Jake Paul and Hasim Rahman Jr. Have Heated Exchange at Press Con…

Dwayne Johnson on ‘Fiercely Independent’ Daughter Simone's WWE D…

Meg Donnelly and Milo Manheim Tease New Adventures in 'Zombies 3…

Pumpkin Surprises Family With Pregnancy News on 'Mama June: Road…

Kevin Hart and Dwayne Johnson on Teaming Up Together Again for ‘…

'Big Brother' Season 24: Paloma Aguilar Exits House Early Follow…

Watch Travis Scott Teach Daughter Stormi How to do Adorable Scie…

Billie Eilish Reveals Why She Stopped Dying Her Hair Wacky Colors

'The Bachelorette' Mansion Doesn't Have Enough Beds for the Guys…
There's more drama than ever when it comes to the new season of Keeping Up With the Kardashians.
Chief among them is 29-year-old Rob Kardashian's long-awaited return to the show, when his sisters confront him about his engagement to model Blac Chyna. The couple got engaged earlier this month, after three months of dating. Rob's timing was notable, given that he proposed while his entire family was away on a vacation in Vail, Colorado.
Obviously, the Kardashian sisters aren't thrilled with the big news.
"He proposed in front of her whole family," Kim says, as it appears the family found out about the engagement on the Internet. "That's so f**ked up."
Kim also confronts Rob on the phone, as a nervous-looking Kylie stands in the background.
"You make sure that your girlfriend doesn't publicly bash your sisters," Kim tells Rob on speakerphone.
Things eventually come to a head when Kourtney, Kim, and Khloe have a sit-down with their younger brother.
"Listen to the hostility in your voice, that's exactly why I don't say anything," Rob testily tells his older sisters. "It's the first time I've ever proposed to someone in my life -- don't come at me with some bulls*it."
Other topics being addressed on season 12 of KUWTK is Khloe's ex, Lamar Odom, making his first public appearance at Kanye West's Yeezy Season 3 Fashion Show in February since almost losing his life in October, and Lamar also meeting Caitlyn Jenner for the first time since her transition.
"What's happening? We got to talk!" Caitlyn tells a clearly uncomfortable-looking Lamar over a family meal.
WATCH: EXCLUSIVE: Lamar Odom Opens Up About Khloe Kardashian Divorce -- 'We've Been Through a Lot'
Last month, Khloe talked about the confusing time when Lamar first met Caitlyn on an episode of her now-canceled FYI show, Kocktails With Khloe. Khloe admitted that she was very protective over the former NBA pro's state of mind.
"When he had his accident and he was in the hospital, Caitlyn was like, 'I want to come and see Lamar,'" Khloe revealed. "Lamar did not know about Caitlyn at that time."
"So, when Caitlyn wanted to come and visit Lamar for the first time was in the hospital, I wanted to respect Caitlyn being Caitlyn, but I also was like..."
A source told ET that the meeting ultimately occurred "a little less than two months" after Lamar returned to Los Angeles.
"I'm not sure if he entirely understood what was going on, but Lamar is very open and non-judgmental," the source said. "He would be open and understanding regardless."
Watch below: