The socialite ex-wife of a Manhattan hedge-fund boss launched a vicious harassment campaign against his current spouse, threatening to flay her and turn her into “wallpaper,” court documents and sources say.

“I want you to hurt, hurt, hurt,” Nirit Resnick Varenbut allegedly told her ex, Josh Resnick, in a post on the Facebook page of his second wife, online food writer Danyelle Freeman.

“I want to be the one who skins her alive. I can make wallpaper out of her.”

Sources said Varenbut even rented a Hamptons home this past summer to spy on the couple, who keep a home in East Hampton.

“This family has been victimized over and over again for far too long,” said their lawyer, Robert Gottlieb. “They have been forced to live in a constant state of fear of physical harm to their children and themselves.”

Resnick was married to Varenbut for about 10 years and had one child with her before they split in 2012.

He and Freeman have two children of their own. They also have custody of his son with Varenbut, sources said.

Freeman wrote for the New York Daily News after starting the blog Restaurant Girl in 2006. She left the paper in 2010.

She and Resnick took out orders of protection against Varenbut in Manhattan Supreme Court and in East Hampton last year.

But Varenbut lashed out again last month, telling Freeman she would “rot in hell” for posing in a Facebook photo with her son, court documents say.

“Josh Resnick married someone more evil than himself,” she allegedly wrote in a Facebook post.

East Hampton Town Justice Lisa Rana sentenced Varenbut to three years’ probation last week after she pleaded guilty to misdemeanor criminal contempt.

Resnick and Freeman declined to comment. Varenbut didn’t respond to a request for comment. Her lawyer, Eddie Burke, declined to talk.

Additional reporting by Doug Kuntz