A tearful Irish woman flew 3,000 miles to testify against a former Goldman Sachs banker who she says raped her in the Hamptons.

The woman said former managing director Jason Lee attacked her in the bathroom of his East Hampton rental during a night of partying in 2013.

Identified only as Dana, the alleged victim said Lee, 38, barged into a restroom where she was changing and attacked her.

“With every ounce of strength I had in me, I pulled my leg up and I kneed him in the groin,” she said as Lee looked on stoically. “He fell off. I just sat there in disbelief. I couldn’t believe it.”

The woman, a student who lives in Ireland, was visiting her brother as he wrapped up a seasonal job on the East End.

Prosecutors argue that the married banker — who left Goldman in the wake of his arrest — met the victim, now 22, while celebrating his birthday with a pal at the Georgica eatery in Wainscott.

The carousing continued at Lee’s $33,000-per-month East Hampton rental pad, while his banker wife was back in Manhattan.

Lee’s attorney, Andrew Lankler, tried to poke holes in Dana’s story by presenting pictures taken prior to the attack of Lee and the woman together.

She told the court that she was never attracted to him and thought he resembled the Mr. Chow character from the “Hangover” movies.

Lee faces up to 25 years in prison if found guilty of the first-degree rape charge.