From frat house to femme fatale.

Sharon Stone says she’s rediscovering her feminine side now that her three sons have grown up and flown the nest.

The “Basic Instinct” bombshell revealed on Wednesday’s episode of “Late Night with Seth Meyers” that she’s back in “lady underwear” after 25 years of wearing boxer shorts and living in what she called a “stinky fraternity house.” 

“You do not wear lady panties when you have so many boys,” Stone said. “You’re just a dude.”

With all three now living on their own, the actress, 67, has reclaimed her closet, her bathroom — and, apparently, her underwear drawer.

“This is a bit of a debutante ball for you,” Meyers quipped.

“I’m back out,” Stone agreed. “I’m a girl again. I feel really feminine again. I grew my hair back — it’s amazing.”

Stone was on the talk show to promote her new movie, “Nobody 2,” an action-comedy in which she stars as a merciless kingpin opposite Bob Odenkirk.

For the appearance, she dressed the part, wearing a polished Akris look from the brand’s Spring/Summer 2025 collection: a sharply tailored asymmetrical leather trench ($4,990) paired with high-waisted flared jeans ($560) and an ivory turtleneck.

She accessorized with a three-strand necklace, skinny leather belt, and mesh stiletto pumps, and wore her blond bob in soft waves.

Stone’s sons — Roan, 25, Laird, 20, and Quinn, 19 — made a rare red carpet appearance with their mom on Monday at the “Nobody 2” premiere in Los Angeles.

She adopted Roan with then-husband Phil Bronstein in 2000 and later adopted Laird and Quinn in 2005 and 2006, respectively, after their divorce.

In addition to her new film, Stone is slated to appear in the long-awaited third season of “Euphoria,” joining the HBO hit in a still-secret role.

“We’re not having any discussions about what’s happening on that set, except to say that I couldn’t be more delighted to be a part of it,” she told Meyers.