Alec’s ‘one & done’ gal tells all! The sex! The kiss-off!

Alec Baldwin (Ken Katz/startraksphoto.com)

Was it as good for you as it was for her, Alec?

Crazypants Alec Baldwin “stalker’’ Genevieve Sabourin whirled into the lobby of the InterContinental Hotel and breathlessly revealed the sweaty details of her one-night stand with the tubby actor.

“He grabbed me and he kissed me,’’ she said, remembering a few minutes of passion in 2010.

“We spent the night together. We made love together.”

The psycho slut, done up in 4-inch Michael Kors purple do-me pumps, was describing a night at the Lowell Hotel when she got lucky and stupid with the man of my dreams.

She had no idea about us.

“He came to my room,’’ the Quebec native said in French-accented English. “He invited himself in for a bottle of water. He told me he was in AA 25 years.

“You want me to tell what’s my favorite position?’’ she shot at me, hitting a bull’s-eye straight into my heart.

“If you make love with him, he’s got a scar. From surgery — or a bullet! It’s a perfect circle. It’s here,’’ said Genevieve, 40, drawing a tiny orb triumphantly with her index finger on her right hip bone.

“How would I know that?’’

She was hooked.

Hey, as one who’s been nipped by Alec on Twitter — a guy who cares about me like he cares about his daughter Ireland, whom he once lovingly called a “thoughtless little pig’’ on an answering machine — I totally get her nutty obsession. But you lose.

Alec arrived at the Lowell. Then he left.

Genevieve said Alec texted his good-bye at 8:30 a.m. from the Hamptons. Dumped. Via text. Ouch.

Genevieve talked to me on Monday, the day before she was yanked, shrieking, in handcuffs from Manhattan Criminal Court. Charged in May with stalking and aggravated harassment, yesterday she was rapped with violating an order of protection. It seems the lovelorn wackadoodle just can’t quit tweeting Alec and current and temporary wife Hilaria Thomas.

The actor has admitted to having dinner with Genevieve. But Alec’s spokesman won’t say if the sex and the dumping are true.

As we spoke, Genevieve cradled an Alec substitute, a hyperactive, rat-sized, 15-month-old Yorkie named Charlie, for Charlie Chaplin.

And before changing into a Black Halo “Jackie O’’ dress and taupe, patent pumps by Stuart Weitzman, she told me her sexy date with Alec occurred the Friday before Valentine’s Day. In her mind, that was akin to a profession of love. Or something.

They met in 2000 on the Canadian set of “Pluto Nash,’’ where Genevieve was a publicist and Alec had a cameo. At dinner with producers, she sat next to Alec, clinging like a Band-Aid. By 2010, she’d moved to New York. The devoted star-lover asked producers for a job.

“I met Denzel Washington. Angelina Jolie.’’ Dropping names faster than confetti, she said she asked a producer friend, “Is Al Pacino doing something?’’

Alec called, she said, at the urging of producer Martin Bregman. She and Alec had long conversations on Facebook.

“He said he dreamed of having a big house with children. He wanted more children. We wanted the same things.’’ At age 37, Genevieve was game.

Then came their date. They took a car ride in Central Park. “For me that was a better gift than a diamond necklace or Dolce & Gabbana dress.’’ They went to see “Dinner with Friends’’ on Broadway. Then, she said, Alec took her backstage to meet Alicia Silverstone.

Then dinner. Then sex.

Then nothing.

“We had phone sex!’’ she cried. “Can you believe him?’’

But then, even phone sex failed to satisfy. So Genevieve decided to confront her wayward beau. She went to his apartment on East 10th Street. She said Hilaria called 911, and Genevieve was arrested.

“This is a love triangle gone bad!’’ she cried like a demon.

Genevieve said her life was destroyed — “all because a girlfriend perceived me as a rival and called 911! I have leprosy. Personally, professionally, romantically. And she [Hilaria] does yoga!”

Admit it, Alec. You don’t want her.

You’re mine.