Rah Ali and Cardi B's sister Hennessey were arguing on social media - and the argument turned to threats of violence.

The drama started last night when Rah crept into Hennessey Carolina's Instagram comments, and started popping off.

Rah and Hennessey's sister have been feuding, and the two ladies actually got into a fist fight at a New York fashion Week party. After the altercation, Cardi was left with a giant KNOT on her head.

So Rah when Rah started popping sh*t in Hennessey's comments - Cardi's lil sister went at her.

Here's the back and forth between the ladies: