No star rocks a plunging dress quite like Kate Hudson.

The Oscar-nominated actress has made dangerously low necklines her red carpet signature over the years, with standout styles including her slinky cowl-neck number at the 2000 premiere of “Almost Famous,” her pink velvet midi from 2003’s “How to Lose a Guy in 10 Days” opening and her custom champagne-colored Roberto Cavalli look from the “Running Point” premiere earlier this year.

As for how Hudson keeps those daring looks perfectly in place at all times? According to her stylist of nearly 15 years, Sophie Lopez, it all starts with meticulous tailoring.

“Those gowns have to fit on the body really well. When the proportions are a little bit wrong, that’s how you get that [gapping and slipping],” the wardrobe whiz tells Page Six Style.

“The best thing you can do is have the garment tailored so that it doesn’t move, and that’s what we do with Kate. Thankfully, we have access to incredible seamstresses.”

But even if you don’t have designers’ ateliers on speed dial, Lopez — who recently teamed up with Cole Haan on a special summer edit — says there are tricks of the trade that help you “cheat” a flawless fit.

“When [the tailoring] is not 100% and there are areas that gape: double-stick tape!” she says, pointing to Topstick — technically marketed for keeping men’s toupees in place — as her personal favorite.

“For me, that’s the one that works the best,” says Lopez. “Some of them don’t stick to fabric very well. Some of them stick really well to skin and not to fabric, or vice versa. But Topstick sticks to both!”

The stylist also swears by nipple covers when working with revealing gowns, but warns that “some are better than others.”

“If they’re too thick, you can see the circle through your clothes — I don’t like that,” she explains.

“I use Bristols 6 [B-Six] Nippies; I’ve used them for years. They seamlessly sit on your skin. I always have those in my kit.”

Ultimately, though, Lopez says the ultimate secrets to pulling off a plunging neckline (or any audacious ensemble, for that matter) are simple: confidence and comfort.

“It’s so important for clients to be comfortable; it comes across in their body language if you force them into something they don’t want to wear,” she tells us, adding that she and Hudson see eye to eye when it comes to taking risks on the red carpet.

“We know each other really well; she trusts me and I trust her.”