The chef and business partner to accused restaurant-perv Ken Friedman says she knew he was up to no good on the third floor of their celeb hot spot Spotted Pig — but had no idea it was the hellish “rape room” that accusers have described, according to a new report.

Michelin-starred chef April Bloomfield says she was aware that partner Friedman used the third floor of the West Village gastropub for drug-fueled parties and dicey behavior — but said she did not know the extent until victims came forward in published articles last December.

“I failed a lot of people,” she told the New York Times Tuesday. “That’s on my shoulders.”

Bloomfield says she was largely unaware of allegations that Friedman groped and kissed staffers, lured them to his car with promises of drugs and demanded nude pictures. And she claims she didn’t know how debaucherous things got in the third floor “rape room,” where Friedman and celeb pals including chef Mario Batali allegedly did drugs and had sex publicly.

One former employee at Batali’s Greenwich Village joint Babbo says she got drinks with the red-haired chef at Spotted Pig in 2005, passed out and awoke in a fog — with semen on her skirt — on the floor of the notorious room.

Batali “vehemently” denied he raped anyone.

Friedman has apologized for for alleged harassment but has claimed “some incidents were not as described.”

Bloomfield, who came to the restaurant in 2003, had full control over the kitchen, while Friedman made the front of house his fiefdom — an arrangement the proved a recipe for disaster, because neither kept much of an eye on the other, the Times reported.

In an apology issued last year, Bloomfield said she “lectured” and “demanded” in meetings with Friedman.

But she told The Times on Monday that she felt too weak to stand up to the restaurateur.

“I felt like I was in a position where he held all the cards,” she said. “He had so much control, and he was so dominant and powerful, that I didn’t feel like if I stepped away that I would survive.”

Some former workers said they believed Bloomfield had really been cowed by Friedman, but others, including former server Trish Nelson, argued Bloomfield “has always been out for herself. She was a perpetrator in a lot of this.”

Bloomfield finally severed their business relationship in June — more than six months after the scathing allegations came out.

State Attorney General Barbara Underwood launched a probe into the restaurant last month.