The Kardashian family drama has officially hit critical mass.
A source reveals to ET that Rob Kardashian's family is "in shock" that the reclusive 28-year-old dating Tyga's former fiancee, Blac Chyna, adding that the relationship has been going on "for two weeks."
"Kylie is absolutely livid that Rob is dating Chyna," the source adds.
WATCH: Why Rob Kardashian Dating Blac Chyna Is So Much More Drama Than You Ever Imagined
In case you're not caught up on Blac Chyna's history with the Kardashian family -- which goes way, way back -- she has a baby with Tyga -- who is now seeing Kylie Jenner on and off -- and is Kim Kardashian's former BFF.
A source close to Rob confirmed to ET on Tuesday that he and Blac Chyna are currently dating, after Rob made a rare (although increasingly less rare) Instagram post sharing a meme of Blac Chyna carrying a car seat, with the caption: "Blac Chyna probably out shopping rite now as she plan to give birth to the only next generation of the Kardashian Name! #Baby Kardashian."
WATCH: Rob Kardashian Instagrams About Blac Chyna Having His Baby
This after Blac Chyna turned up the heat on rumors of the couple’s romance on Monday. The 27-year-old model posted a photo of herself holding what appears to be Rob's tattooed arm, writing, "The beginning."
"The beginning" probably undersells the Keeping Up With the Kardashians drama this has most likely unleashed.
WATCH: Tyga Steps Out With Mysterious Kylie Jenner Lookalike
One person who doesn't seem phased by all this Rob relationship news is Tyga. The rapper taped an interview on the upcoming Kocktails with Khloe on Monday, seemingly in good spirits.
Watch the video below for more of Blac Chyna's tangled history with the Kardashians.