The upstate man accused in the grisly murder of teenage social media star Bianca Devins pleaded guilty on Monday, according to a new report.

Brandon Clark, 21, of Cicero, entered the new plea on Monday — with the understanding that he could face 25 years to life behind bars, Oneida County District Attorney Scott McNamara told Syracuse.com.

He initially pleaded not guilty to second-degree murder in connection with the July slaying and was scheduled to go to trial later this month.

Clark — who was a friend of Devins, but not romantically involved, according to the family and police — flipped out when the influencer kissed another man at a Queens concert July 13.

Early the next morning, the couple drove back upstate to Utica, where Clark allegedly slit Devins’ throat with a large knife.

He then posted a gruesome photo to Instagram of himself with Devins’ body — as well as another photo of his bleeding neck after he cut his own throat.

The graphic photos have since been shared on various social media platforms — and while some companies have removed them, they remain online elsewhere.

Bianca’s mother, Kim Devins, has been working with politicians to push for new laws that restrict the posting of graphic photos like those of her daughter, according to Syracuse.com.

Sentencing for Clark — who apologized for his actions in court — is set for April.