The city Law Department is hiring Spiro to work on the case, according to a new public filing.
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The allegation dated to Adams' time in the police department. A former NYPD aide alleged Adams harassed her in 1993 when they both worked for the transit bureau.
The defense will portray the allegation as "fiction," and move to get the case dismissed, sources familiar with the strategy told ABC News.
On Tuesday, the mayor addressed questions about Spiro and said he will leave allegations of inappropriate behavior to his attorneys to defend while he focuses on running the city.
"I have great attorneys, I am pleased with my attorneys, with what they are doing, the process is going to take its course," Adams said. "I sleep well at night with my little teddy bear because I follow the rules."
The city appears to be getting the high powered attorney at a bargain price. Spiro's client list has included Elon Musk, Jay-Z and Patriots owner Robert Kraft.
"I don't know how one becomes a celebrity lawyer, am I a celebrity mayor?" Adams said.
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Attorney Arthur Schwartz has sued the city 800 times and several mayors. He says it's not unusual for corporation counsel to bring in outside attorneys and he believes it makes sense.
Most lawyers on the city's payroll lack the experience with the media in such a high-profile case.
Experts also point out this is a civil lawsuit and it's an individual suing Adams -- not an investigation by the DA, the Attorney General or the FBI.
"There is a separation between the mayor's office and corporation counsel just like we talk about the one between the president and the attorney general," Schwartz said. "The mayor didn't make the decision to do this."
In a statement, the law department says:
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"In certain cases, the Law Department retains outside firms to provide assistance during litigation. We retained the firm of Quinn Emanuel to serve as co-counsel to assist us in representing the city and the mayor in this case to ensure the Law Department can maximize its existing resources on our numerous other matters."
Spiro is a partner at Quinn Emanuel Urquhart & Sullivan. They did not respond to a request for comment.
RELATED | Mayor Eric Adams sued by woman who says he sexually assaulted her in 1993
Mayor Adams accused of sexually assaulting woman in 1993
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