Gina Gershon dishes on the frankness of Showgirls and the superficiality of Prince.

Gina Gershon is standing her ground.

In her new memoir, “AlphaPussy,” the sexy actress recounts how she “survived” growing up in California’s San Fernando Valley in the ’70s and ’80s — “in the middle of the porn explosion” — and went on to thrive in Hollywood on her own terms.

Gershon, whose credits include “Face/Off,” “Curb Your Enthiasm,” “Riverdale” and “Rescue Me,” writes about dodging deviants on the street — and in the Playboy mansion — in her youth and then standing up for herself when she came up in the entertainment industry, even when it meant refusing to work with Prince and squabbling with famous directors.

“It’s like a collection of my personal stories about dealing with toxic situations and difficult people…and maintaining my sovereignty,” she told Page Six in an exclusive interview.

Not everyone was unpleasant. Gershon recalls a brief but positive encounter with a group of celebrities, including Bruce Willis, who tended bar at the café she worked at in college and made her boyfriend feel threatened by his “charm and arrogance”; Bob Dylan, who boxed with him at the gym; And Sharon Stone, who advised her to lie about her age.

However, filming with director Paul Verhoeven on the 1995 film “Showgirls” – a massive flop in its time and which has since become a beloved cult classic – was extremely difficult.

“It was a constant psychological tug of war between Paul, (co-star) Elizabeth (Berkeley), and me… Paul was notorious for fighting with his co-stars, and—lucky for me!—I believe I was his chosen sparring partner in Showgirls,” wrote Gershon, who played stripper Crystal in the film.

One day, the director walked into her trailer. “In today’s scene, I think it would be nice to show your vagina,” he declared, noting that Berkeley would have done so and that Sharon Stone had done so in his final film, “Basic Instinct,” in an infamous scene.

Gershon wasn’t looking forward to the fight, but she wasn’t willing to withhold everything and it wasn’t in her contract to do so. She took a moment, came up with a plan and then sat down with Verhoeven.

“I completely understand what you want to do with this shot, but the fact is that we saw it. As I already pointed out, we saw Sharon’s vagina, and we’re going to see Elizabeth’s vagina,” she told him diplomatically, as she recalls in the book. “So I was thinking, well, just imagine this: It’s dark. We don’t know where we are. It’s fuzzy. Then pink. Then kind of fuzzy. Next thing you know, we’re in Crystal’s dressing room… But wait! How did we get here? Then we realize we were inside! We were inside Crystal vagina!! Instead of just showing my pussy like Sharon and Elizabeth, let’s take it from there inside vaginal! …We can even use a microscopic lens! No one has seen that before. “It’s great.”

Verhoeven was surprised and said he was not sure if they could pull off such a shot. He looked at Gershon as if she were “crazy,” said it was okay for her to do the scene as originally written, without needing a take, and walked away. (A rep for Verhoeven said he was unavailable for comment.)

“He never mentioned my vagina again,” she writes.

She dodged another bullet at age 15, when she went to a party at the Playboy Mansion with a friend.

Another guest attacked her and gave her a tour of the palace, including the infamous grotto.

When he asked her if she wanted to swim, Gershon hit the brakes.

“I remember looking at him and just laughing, ‘Do you know I’m only 15? You can get into a lot of trouble,'” she told Page Six.

Fortunately, he snuck away.

By contrast, Tom Cruise was “the eternal man” when they starred together in the 1988 film “Cocktail,” Gershon writes.

She was filming a love scene with him, her first ever, and the script called for them to frolic naked around a hot tub and kiss, “which seemed gratuitous and lame.”

Gershon suggested something more subtle under the covers in bed, and Cruz was game.

“I could not have asked for a more supportive, communicative, and trustworthy partner,” she writes. “He even suggested that I move away so my breasts weren’t in front of the camera, just facing him.”

The beauty had a less positive experience with Prince when she was an acting student at New York University.

One day, she received a phone call from an old friend who worked with the late musician and told Gershon, “The prince wants to meet you. He is shooting a movie and the lead woman must be able to sing, dance and act. I told him about you.”

Naturally, Gershon was thrilled and jumped on a plane to Minnesota, where she was greeted by a purple limousine with Prince inside.

He played the theme song from his upcoming movie, “Purple Rain.” She blew up and the two went somewhere to talk, drink and dance.

Then the musician turned to her and said, “I think I’ll call you Ghe-na, (strong G sound).”

“Gina?” She replied, trying not to laugh. “As in gi na gershon?”

“No,” he answered very seriously. “Just ghee na.”

It was too much for her. She told Prince she didn’t want the role, even though it would have been her big break.

“I don’t want to be called ‘Gi-Na’ for the rest of my life,” she told Page Six. “It was more than that… I’ve never had anyone look at me like that. It felt like they were rearranging my molecules… I felt very uncomfortable about it.”

“I often regretted not working with Prince,” she admits in the book, “I would have fought for the chance to be able to make music with that genius. But I didn’t like being controlled… For better or worse, I listened to my instincts.”

Gershon also trusted her intuition, when after finishing “Showgirls” she was sent a new script called “Bound” to read.

The noir thriller featured a love story between two women, and Gershon’s agents at the time refused to let her do that, because she had just played a bisexual role in Showgirls. They feared another on-screen romance would ruin her career.

Reluctantly, Gershon fired her agents and signed on to star in “Bound” opposite Jennifer Tilly.

She is proud to be a part of the film, which was one of the first mainstream films to feature a same-sex relationship and love scenes.

“The lesbian community has really embraced this idea because they haven’t been represented in this way before,” she said. “It was a big deal, and I feel really proud of it. When people come in, they say, ‘You really helped.’ This movie helped me, it helped me realize things.’ That was the icing on the cake.”

Most recently, Gershon was introduced to a new audience when last year she played Bowen Yang’s clingy girlfriend in a “Bowen Street Life” skit on “Saturday Night Live.”

“I love him,” she said of the “evil” star. “I just adore him. He’s a great guy.”

Although she swears that “AlphaPussy” is not a self-help book, she still hopes that it is “empowering in some way” and teaches women to be direct and stand up for themselves.

“There are a lot of toxic people out there, and they want to tell you what to do, what to think,” she said.