Reports: Kylie Jenner Believes Blac Chyna 'Brainwashed' Rob Kardashian

The Kardashian-Jenner clan was absolutely clueless that Rob Kardashian was planning to propose to Blac Chyna, his girlfriend and the archenemy of his sister Kylie Jenner. Now the youngest member of the first family of reality TV believes Tyga's baby mama "brainwashed" her brother.

“Kylie is livid with this whole engagement thing,” a source told Hollywood Life.

TMZ reported the Kardashian-Jenner clan had no idea Rob, 29, the only son of Kris Jenner, was planning to propose to Chyna. The site noted that Rob waited until his family was out of town on vacation to pop the question to Tyga's baby mama.

“She is convinced Blac Chyna has a hidden agenda and is using Rob,” the source said. “She’s stressed out about the whole thing and just wants her mom and Khloe to talk some sense into Rob. She thinks he has been brainwashed!”

The 27-year-old model and former exotic performer posted a photo that definitely raised some eyebrows. She was seen sporting a massive diamond ring on that finger and captioned it: “YES!...!...!”

Even momager Kris is wary. Although she is happy for her son, she still thinks Rob didn't have enough time to think things over.

“Kris is worried that Rob made an impulsive decision when he proposed to Blac Chyna. She fears Blac may have given him an ultimatum and that’s why he acted so hastily," an insider previously told Hollywood Life. She’s obviously happy that Rob has met someone, but she just thinks this whole engagement has not been thought out.”