Kylie Jenner's Instagram feud with Blac Chyna over the latter's recent "Kylie Jenner Lip Challenge" diss has escalated. According to a report from Hollywood Life, the "Keeping Up with the Kardashians" cast member's rumored boyfriend, Tyga, is mad at his ex-girlfriend for mocking the reality star.

Kylie Jenner was mocked by Blac Chyna on Instagram after the 26-year-old starlet posted an image at the height of the #KylieJennerChallenge. The photo showed the mother of Tyga's two-year-old son, King Cairo, seemingly copying Kylie Jenner's infamous pout while holding a her phone for a selfie.

However, Blac Chyna had a massively exaggerated red lips, as if to ridicule the 17-year-old TV personality.

Tyga then took matters into his own hands by reportedly calling Blac Chyna. The phone confrontation between the 24-year-old rapper and his ex-girlfriend reportedly got very heated.

"He told her this is stupid and is going too far, and told her to act her age," a source said.

"When he told he that, all hell broke loose. Blac cursed him out."

"It was brutal - she really let Tyga have it and cut him and tried to cut him and Kylie to shreds," the source revealed.

The "Rack City" rapper is said to be desperate to end the feud between Blac Chyna and Kylie Jenner over Instagram posts.

"What he really wants is for Kylie and Blac to cut it out and just be civil and peaceful," an insider said.

"He can't control what Blac does, and he doesn't want to, but he does want her to be an adult and respect his relationship with Kylie."

A related report from Hollywood Life said that the only reason why Blac Chyna is continuously slamming Kylie Jenner via Instagram is because she still loves Tyga.

"Blac is still totally in love with Tyga. She is constantly trying to get his attention," a source explained.

"She'll call in the middle of the night and she has to answer her calls because it could be about their son, King Cairo. It drives Kylie nuts!"

"[Kylie] hates that Tyga always picks up the phone. It's caused a lot of fights between them," the insider said.