Kanye West has caused an uproar online following the release of his new track XTCY, on which he raps about wanting to have sex with his sisters in law.

The track was released on Twitter by DJ Clark Kent, and features the lyrics: "You got sick thoughts? / I got more of 'em / You got a sister-in-law you would smash? / I got four of them".

He also raps about masturbating to their photos, adding: "Damn, those is your sisters / You did something unholy to them pictures / Damn, you need to be locked up / Nah, we need a bigger hot tub".

The new track was released on the 21st birthday of Kim's youngest sibling, Kylie Jenner. The cover art for "XTCY" is a cropped photo of the Kardashian-Jenner sisters at Kylie's party on Thursday, which she had posted on her Instagram page.

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BIRTHDAY BEHAVIOR! WERE ALL TURNING 21!!

A post shared by Kylie (@kyliejenner) on

Kim, 37, Kylie, and their remaining three sisters—Kourtney Kardashian, 39; Khloe Kardashian, 34; and Kendall Jenner, 22—have not commented publicly on the track.

But music fans have, taking to Twitter to slam the rapper.