Rob Kardashian, Blac Chyna Hook Up: Tyga Feels "Stabbed in The Back"

Tyga has been professing his love for Kylie Jenner, letting the world know that she is his "Grammy" and the other girls are just "nominees" in his new track "Gone Too Far." So what is his reaction after hearing that Rob Kardashian is allegedly dating his baby mama, Blac Chyna?

Hollywood Life has exclusively learned that Tyga is "stunned" after learning about the hook-up.

“He didn’t see nothing like this coming where his homie Rob would be crushing on his baby’s mother," the source told the publication. "Like what? This is some crazy drama that even Tyga can’t deal with."

The source then went on to say that Tyga and his on-and-off again girlfriend's older brother have a good relationship, so this comes as a shock for him that the 28-year-old Arthur George owner actually considered hooking up with Chyna.

"He and Rob are mad close and Tyga feels like Rob just stabbed him in the back," the source continued. "Mind you, Tyga doesn’t know when Blac and Rob took this picture but still, the writing is on the wall and the damage is done.”

Blac Chyna took to Instagram on Monday, Jan. 25, to share a black and white photo of her and Kardashian's distinctive tattooed arm.

“The beginning,” Chyna captioned the pic fuelling dating rumors.

A photo posted by www.Lashedbar.co (@blacchyna) on Jan 25, 2016 at 6:07am PST

This new romance didn't sit well with Kardashian's family, especially with Kylie Jenner, who believes that he needed an "intervention" for hooking up with her number one nemesis.

“She’s just bad for Rob and Kylie’s determined to educate her brother on how she can singlehandedly destroy his life like she tried to do with Tyga. Kylie’s heated. She’s really bothered by this ordeal,” the source told Hollywood Life.