An upstate woman choked a nightclub bouncer unconscious because she thought he grabbed her butt — only to learn one of her own friends was the real groper, according to a new report.

Plattsburgh resident Kierah Lagrave, 22, was at Five1Eight nightclub, where she works, on Oct. 20 when someone hit her from behind, according to the Press-Republican newspaper.

The 125-pound woman then walked up behind the club’s bouncer and strangled him until he fell to the floor unconscious, police told the paper.

When cops questioned Lagrave about the incident, she acknowledged choking the guard but said it was because he grabbed her.

However, police say security footage revealed the bouncer was innocent.

“The surveillance video clearly shows that Lagrave’s friend slapped her on the buttocks [beforehand],” Plattsburgh City Police Chief Levi Ritter told the paper.

Lagrave was arrested Thursday and his with the felony charge of second-degree strangulation. She was released on her own recognizance, the Press-Republican reports.