Big sister Khloe Kardashian has now reportedly stepped in and got involved in the drama.
The feud first started when Kylie Jenner 17, reportedly started dating 25-year-old rapper Tyga, who had recently split from his baby mama Blac Chyna.
Kanye’s ex, also Blac Chyna’s BFF, Amber Rose hit out at the couple, branding the relationship inappropriate due to the age gap.
And although 26-year-old Blac Chyna- formerly Kim Kardashian’s BFF (complicated, we know), remained silent at the time, it appears she has been having an ongoing Instagram feud with Kylie.
And in her most blatant dig at the reality star so far, the mother-of-one posted a picture posing with a ridiculous pair of wax lips- the same day the 'Kylie Jenner lip challenge' was trending.
That was a step too far for protective older sister Khloe, who according to Radaronline called Blac Chyna up to confront her.
“Khloe called Blac Chyna yesterday and let her have it after she saw that,” the insider says.
“Kylie thought that it was really messed up of her to go and do that on a day when there are tons of kids out there suffering because they think that they have to attain Kylie’s level of beauty,” the insider tells Radar.
“It was completely insensitive and heartless of her and Kylie wants to fire back so badly.”
According to the source, Kylie 'cannot wait until she is 18 so her and Tyga can make out on her Instagram and Blac can just sit home and cry about it.'
“But because Khloe is pretty much Kylie’s mother, she is not going to let this b*mbo go and talk smack about her baby sister,” the source says.
However the story now has a new twist, with Blac Chyna posting an apparent screengrab of Tyga's recent 'suggestive' messages to her.
Ladies, ladies! Has no one told you silence is golden?