Police believe YBN Almighty Jay and his crew robbed Skinnyfromthe9 of cash and jewelry. 

TMZ reports that Jay was shooting a video this past Thursday in Chatsworth, Calif. When it was over he and his crew walked away with a $40,000 necklace, a $20,000 Rolex and $20,000 in cash that police say belonged to Skinny.

There's video footage of a couple of men rushing the New Jersey rapper while he was sitting in a Range Rover, and you can clearly see them tussle with him, jump in a car, then drive off. 

This went down a couple of days after Skinny let YBN Almighty Jay crash at his house while they made music together.

It's certainly been a rough February for Skinnyfromthe9, considering he was nearly beat up by Zoey Dollaz's crew not too long ago. He also had some other people try to steal his chain back in December, but he fought those guys off.  

Why do you think the driver of the Range Rover didn't assist Skinny in this recent robbery? Because if you notice, he didn't react until the car sped away.