Drug company execs hired an ex-stripper to help peddle their highly addictive fentanyl spray — and she employed all her talents out in the field, according to blockbuster trial testimony.

A former Insys Therapeutics sales rep told jurors that she was present when her boss, former exotic dancer Sunrise Lee, gave a crooked doctor a lap dance in a Chicago nightclub in mid-2012.

Holly Brown testified that she was on the dance floor at The Underground when she looked over and saw Lee, then an Insys regional sales director, giving Dr. Paul Madison the hard sell, according to reports.

Lee, 39, was “sitting on his lap, kind of bouncing around,” Brown said. “He had his hands sort of inappropriately all over her chest.”

During Brown’s testimony Tuesday, she described Lee’s sales pitches as “sexually suggestive” and said they involved “a lot of cleavage,” the Boston Herald reported.

She described the lap dance as “disappointing” and “certainly something I as an employee was not willing to engage in,” the Herald said.

At the time, Madison, 65, was running what Brown described as a “shady pill mill,” according to an email shown to the jury in Boston federal court.

The pain-management specialist and anesthesiologist was also paid at least $70,800 in bribes disguised as “speaker fees” from Insys for prescribing the company’s fentanyl-based Subsys spray, prosecutors say.

Madison, whose medical license was suspended in 2016 for “unprofessional conduct and distribution of controlled substances for non-therapeutic purposes,” was convicted last month in an unrelated, $3.5 million insurance-fraud scheme and is awaiting sentencing in Chicago.

Lee and three other former Insys execs are standing trial with company founder John Kapoor on racketeering charges in an alleged scheme to bribe doctors across the country to prescribe the company’s fentanyl spray to line their pockets.

The trial is the first in which drug company execs face criminal charges arising from the nation’s deadly opioid crisis.

Insys’ tactics included advising sales reps “to behave more sexually toward pain-management physicians, to stroke their hands while literally begging for prescriptions,” according to a 2016 whistleblower suit filed by a former Insys sales rep.

Before being hired by Insys, Lee was a dancer at Rachel’s Gentlemen’s Club in West Palm Beach, Fla., according to a 2015 report by the online Southern Investigative Reporting Foundation.

“Doctors really enjoyed spending time with her and found Sunrise to be a great listener,” then Insys-exec Alec Burlakoff told the site.

Lee also “managed an escort service and had no academic degree,” according to court papers filed in another whistleblower suit against the company.

Both suits were settled, along with three others, for $150 million in August, when the Justice Department intervened and took over the cases.

Other prosecution witnesses are expected to include former Insys CEO Michael Babich and Burlakoff, both of whom pleaded guilty and agreed to cooperate with the feds.

With Post wires