Zayn Malik has blasted his friend and producer Naughty Boy, calling him a ''fat joke''.

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.

The 22-year-old singer tweeted on Monday (13.07.15): ''@NaughtyBoyMusic you fat joke stop pretending we're friends no one knows you (sic).

''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 on Sunday (12.07.15), 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)''