A partner at a prominent Manhattan white-shoe law firm was arraigned Monday on charges he pleasured himself inside an Equinox sauna while ogling a gym staffer.

Steven Hammond, 65, stood before Judge Sandra Roper to face charges of public lewdness and exposure of a person, which could land him in jail for up to three months.

The Hughs, Hubbard & Reed litigator was enjoying the sauna at the Wall Street gym about 4:30 a.m. June 29 when he allegedly began to stroke himself while winking at the alarmed staffer, according to the victim and court papers.

Hammond stared at the stunned man and continued to gratify himself for at least a minute, the 27-year-old employee previously told The Post. His name is being withheld due to the nature of the charges.

The judge released Hammond without bail and issued an order of protection his accuser.

Defense lawyer Isabelle Kirshner said, “Mr Hammond vehemently denies these specious charges and intends to launch a full and complete defense.”

The employee said he was discouraged by management from reporting the incident but eventually went to police.

Equinox faces lawsuits from dozens of complainants who claim the company ignores sexually inappropriate behavior of its wealthy clients.