Blac Chyna's 18 year old boyfriend has been dumped and we cannot believe who for!!

Okay, this is one we didn't see coming! #WTF

Blac Chyna's man YBN Almighty Jay has DROPPED her for someone new - the 15-year-old female rapper Danielle Bregnoli, AKA Cash Me Outside girl.

They've been spotted in public and are apparently working on a song together!

And just in case you are wondering - NO it is not illegal for an 18 year old to "date" a 15 year old - so long as no s*xual contact is happening.

What's crazy is that just a few days ago YBN Jay Almighty wrote on Instagram a proposal of marriage to the model, Blac Chyna, 29, on his Instagram account LAST Tuesday just two months after the two were first spotted together.

As for Danielle, the 15 year old has been running all around Hollywood causing drama. She was caught on video in a verbal and physical fight with Woah Vicky, another "Instagram celebrity." The fight go heated as Danielle put HANDS on Vicky.

Let's see how this one pans out... just watch out, Blac Chyna might throw her stroller at you.