The CEO of a New Jersey addiction clinic sexually assaulted a recovering alcoholic he employed when she relapsed and was in “a drunken stupor,” a new lawsuit alleges.

Andrea Pierce, a director at the Recovery Centers for America in South Amboy, claims CEO James Haggerty preyed on her as she struggled with her sobriety, according to a new lawsuit filed in Middlesex County Superior Court on Tuesday.

The 38-year-old Long Branch woman had an affair with Haggerty — a married man who is over 20 years her senior — in the summer of 2019, only a few months after she started working at RCA, according to the court papers.

Haggerty, 61, allegedly promised to leave his wife for Pierce, and the affair caused her to fall off the wagon and landed her in a New Hampshire rehab, the court documents say.

When Pierce came back from rehab she tried to break things off with Haggerty — but she alleged he  relentlessly flirted with her at work, asking her to bend over so he could see her butt, for sexual favors and nude pictures and to take off her panties so he could keep them in his pocket, the suit claims.

And twice, in November and on March 9 this year, when Pierce had relapsed, Haggerty allegedly had sex with her “while she was in a drunken stupor and unable to consent,” the court papers charge.

Pierce reported the March incident to the Long Branch Police Department and had a rape kit performed on her at the hospital, the court papers say.

The Long Branch police — who she says came to her apartment to gather evidence — did not immediately return a request on the status of the investigation.

Pierce “spent the next several days drinking alcohol and crying non-stop” and checked herself into another detox facility, her suit says.

She remained in the facility from March 18 through 25, and has been on leave from work ever since, according to the court filings.

Pierce also reported the incident to the workplace, and alleges she faced retaliation and has “been threatened with adverse employment action, including termination,” the suit claims.

“I had this perfect job, and I love what I do,” Pierce told The Post through tears. “I love helping people and that is just gone now … I stay in bed all day and I cry.”

Pierce said she felt trapped in her situation. “I would go to work everyday and do what I had to do. I am a professional woman. I am very educated but he diminished that,” said Pierce, who is suing for unspecified damages.

“RCA willingly and indifferently allowed CEO James Haggerty to repeatedly harass, humiliate, and sexually assault Ms. Pierce,” her lawyer, Peter Valenzano, added. “After reporting this behavior to the company, Ms. Pierce was subject to retaliation designed to oust her from her role.”

RCA said it was recently made aware of Pierce’s claims and the company “has launched a full investigation.”

“The events alleged by Ms. Pierce are unfortunate and we are confident that the legal process will reveal the truth,” the statement continued.

Haggerty declined to comment.