Reports of Rob Kardashian’s romantic involvement with Blac Chyna are getting Kylie Jenner pissed.

According to a People magazine source, “Kylie is livid.” The source added, “She feels super betrayed and can’t understand why someone in her own family would stab her in the back like that.”

News of Rob’s relationship with Blac Chyna hit the Internet recently. An Instagram pic of hers, captioned “The beginning,” appeared last Monday. In it, a heavily tattooed arm envelops her.

TMZ later confirmed suspicions about the arm’s owner. The report added the pair are spending time together. The couple have yet to confirm their relationship.

A meme recently posted by Rob adds greater confusion. On Tuesday, he joked about having a baby with Blac Chyna. In the photo, Chyna holds a car seat.

The caption read, “Blac Chyna probably out shopping rite now as she plan to give birth to the only next generation of the Kardashian Name! #BabyKardashian.”

Kylie is not the only one troubled by the news of Rob’s relationship with Blac Chyna. Recently, elder sister Khloe Kardashian tweeted, “You can do anything. But never go against the family.”

However, Khloe said she meant it for another family member. However, her succeeding tweet seemed to reference Rob’s current relationship.

The connection between Blac Chyna and the Kardashians go back a couple of years. Known as Angela Renee White in real life, she once was close to Kim Kardashian West. That is no longer the case after Kylie and Tyga started dating.

She is also the ex-fiancée of Kylie’s beau, rapper Tyga. They have a 3-year-old son together. However, they split up in 2014.

Afterwards, Tyga and Kylie began dating. However, their relationship only became public last August when Kylie turned 18.

Tyga is now close to the Kardashian-Jenner family. He even joined the brood for a summer vacation in St. Barts.