Zayn Malik had a falling out with Naught Boy in a huge way as the former One Direction hottie slammed the music producer on Twitter.

The whole problem started when Naughty Boy reportedly leaked Zayn Malik's video "No Type." The music video featured the former One Direction member singing with Krept & Konan.

"The two were super chummy ever since Zayn left 1D, so seeing Zayn's viscous tweets coming after him on July 13 was shocking, to say the least!" said Hollywood Life. "He called him a 'fat joke' and said they are no longer friends!"

Perrie Edwards's fiancé wrote, "Someone learned how to upload a video... maybe now he should learn how to use logic ha you ain't shit but a faker."

If that was vague enough for some on who the message was directed to, Zayn Malik tagged Naughty Boy as he wrote, "you fat joke stop pretending we're friends no one knows you."

Meanwhile, Naughty Boy reportedly responded to Zayn Malik's abusive tweets, according to E! News, although in an "ominous, potentially telling messages of his own."

The music producer wrote, "This 'music' business teaches you the tricks but never the truth. you know who you are."

Later, he added, "don't bite the hand that feeds you."

"It seems that Zayn's solo career is getting off to a bit of a rocky start. One Direction's remaining members, however, seem to be moving forward musically just fine without their fifth bandmate," E! reported.

Krept & Konan talked about their collaboration with Zayn Malik in an interview with IBTimes for the music video "No Type."

"We've done a little cover with [Malik] and we shot a video but it just didn't end up coming out because it didn't get finished," Konan said. "After that we heard the news about [Malik quitting One Direction]. But it was a while before though, it was just a muck around thing. It wasn't really nothing too serious."