Luthcke was invited to Bravo's "Watch What Happens Live" in honor of National Policewoman's Day on Sept. 12, host Andy Cohen said.
Her task, he said, was to "serve and protect" his top-shelf booze while he interviewed Cary Deuber and Stephanie Hollman of Bravo's "Real Housewives of Dallas."
Luthcke herself had a water with lemon -- her drink of choice.
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ALSO SEE: Bergen County prosecutor's detectives on Saturday took a man into custody and seized a Chevy Trailblazer that they said ran over a Hawthorne man in Ridgewood, killing him, earlier this week.
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"WWHL," which began as a web series, airs five nights a week -- and at one point reached 3.5 million viewers.
Shot in Manhattan, it aims for a cocktail-lounge feel, offering its guests drinks (Oprah once had a vodka soda) to loosen them up for questions they haven't been prepared for. There are also drinking games for viewers.
Sponsored by 7-Up, the bar has been tended by, among others, Rod Stewart, Kelly Ripa and Jon Bon Jovi's son, Jessie Bongiovi.
The guest barkeeps don't actually make drinks -- it would make too much noise in the tiny "clubhouse." The job is handled by a crew member (aka production assistant) during commercials.
Luthcke was sworn in as Ridgewood's first female police chief in July 2016 -- one of only two in Bergen County. Bergenfield's Cathy Madalone is the other.
SEE: New Ridgewood Police Chief Brings Vast Knowledge In All Aspects
"Have you dealt with a lot of stupid criminals?" Cohen asked her on the show.
Luthcke smiled.
"If there weren't stupid criminals," she said, "I wouldn't have a job."
SEE: "WATCH WHAT HAPPENS LIVE" (with Ridgewood Police Chief Jacqueline Luthcke)
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