Cheryl's fans have been left shocked after a post branding her a "b****" appeared on her Instagram.
The trolls also slammed boyfriend Liam Payne in a series of bizarre Satanic posts.
The first post included a screen grab of a Twitter profile page with a caption urging her 2.7 million followers to follow the account, based in Denmark.
A similar post of a separate account followed shortly after before a third image, a picture of an upside-down white crucifix on a black background appeared.
The caption read: “666 F*** LIAM PAYNE.”
Bit harsh, calm down mate.
The capitalised words “HAIL SATAN 666 B**** THATS WHAT WE DO” accompanied a fourth image of a black and white pentagram.
This is just getting weird now...
Cheryl’s biography on the Instagram page was altered to read “#Cyberwolfgang N***A”.
Fans quickly noticed the unusual posts being made via her account and notified Liam and Cheryl’s close friend Kimberley Walsh to the takeover.
Within 45 minutes of the takeover happening, the former Girls Aloud star’s profile page was back to normal with her bio reverted to simply read her name.
Neither the singer nor Liam – who is currently in America – has responded via their social media channels to the trolling.
A spokesman for Cheryl has yet to respond following the hack.
The overtaking of the singer’s online account comes days after she was granted a divorce in just 14 seconds from Jean-Bernard Fernandez-Versini.
The former X Factor judge sought a divorce from the French restaurateur after complaining that his unreasonable behaviour had caused her stress and weight loss.
A family court judge last Thursday drew the couple’s marriage to a close.
Judge Heather MacGregor granted a decree nisi – after concluding that the marriage had “broken down irretrievably” – at a speedy hearing in the Central Family Court in London.
A spokesman for the singer had announced that a decree nisi had been granted more than an hour before the court hearing began.