Things are getting NASTY! Zayn Malik has blasted his (former) friend and producer Naughty Boy on Twitter.

The former One Direction star posted a tweet saying that the La La La hitmaker is not his friend and that he should "stop pretending" they are pals because "no one knows" who he is before calling him a "fat joke".

He continued with another tweet declaring, "Someone learned how to upload a video... maybe now he should learn how to use logic ha you ain't s*** but a faker (sic)."

Naughty Boy - whose real name is Shahid Khan - is yet to respond to the direct tweet, which is thought to refer to the leaked snippet of a music video Zayn shot with Krept & Konan for his cover of No Type.

However, the producer did tweet a cryptic post, which read: "don't feed the hand that bites you (sic)."

Both Naughty Boy and Zayn have now un-followed each other on the social media channel.

The former 1D hitmaker previously defended the producer when he got into a Twitter spat with Louis Tomlinson.

Following an exchange of insults between his ex-bandmate and Naughty Boy, Zayn asked Louis: "remember when you had a life and stopped making b****y comments about mine ?'(sic)"

Source- NZ Herald / Photo- Getty Images