Calvin Harris is going on the defensive for his girlfriend, Taylor Swift.
An unlikely Twitter feud erupted on Monday between the 31-year-old DJ/producer and 22-year-old Zayn Malik, after Harris defended Swift against what he apparently saw as shade from the ex-One Direction member. It all started when Malik retweeted a post from @FemaleTexts, which juxtaposes a Swift quote with a Miley Cyrus one, comparing the two singers' stance when it comes to getting paid for their music.
"The difference is astounding," the caption reads.
WATCH: Miley Cyrus Calls Out Taylor Swift's 'Bad Blood' Music Video -- 'That's Supposed to Be a Good Example?'
Harris obviously took the retweet personally.
"@FemaleTexts @zaynmalik You've made your money? Cool...f**k the 99% of musicians who depend on these services to survive right? Yeah f**k em," Harris tweeted in response. "If u don't get what it means when a successful artist uses their celebrity to benefit every other musician and songwriter in the industry... While u kids are refresh voting teen choice awards there's some poor f**ker in a basement making your new favorite record trying to survive. Meaning...stay out of things you don't understand."
Never one to back down from a Twitter fight, Malik called out Harris with even more pointed insults.
"@CalvinHarris ha you just made an absolute fool of yourself mate," Malik wrote. "You clearly didn't understand what I just said either. So I suggest you calm your knickers before them dentures fall out."
Harris later attempted to squash the beef, writing, "All good, it was the quote not you personally mate." Only, Malik clearly wasn't having it.
"Oh and I write my own sh*t too d**khead" he wrote, to which Harris diplomatically replied, "Best of luck, genuinely. You've got a great voice."
Malik is no stranger to Twitter drama. In May, he had a public feud with his former 1D bandmate, father-to-be Louis Tomlinson. "@Louis_Tomlinson remember when you had a life and stopped making bitchy comments about mine?" he wrote.
He again got called out by 1D fans late last month, when he threw some not-so-subtle shade at the British boy band's music.
"I guess I never explained why I left," he wrote. "It was for this moment to be given the opportunity to show you who I really am! #realmusic #RCA!!"
WATCH: Zayn Malik Responds to Twitter Feud With Louis Tomlinson -- 'People Got It Twisted!'