Cassper Novest & Riky Rick. Picture: Instagram

Controvertial musician Ntsiki Mazwai took some time out from shading the Queen B and shifted her attention to Cassper Nyovest.

Ntsiki Mazwai went on a Twitter rant calling the Doc Shebeleza rapper an "undercover a*shole”.

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Cassper has yet to respond to the tweets, and we’re sure Ntsiki can’t wait for the reply.

See all the shady tweets below: