Oh, snap!

Kate Beckinsale shared the heroic efforts of her “Much Ado About Nothing” co-stars Keanu Reeves and Robert Sean Leonard — 30 years after a near-disastrous wardrobe malfunction.

In celebration of her return to the Cannes Film Festival, Beckinsale posted an Instagram photo Monday that captures her between the leading men of the 1993 flick.

Sharing a “fun fact” about the event, the 49-year-old actress reflected on her gray and green tie-dyed-colored bodysuit with a matching shawl.

“I had bought the bodysuit in the Sock Shop at the airport and when I got in the car to drive to the premiere with Denzel and Pauletta Washington, all the poppers in the crotch popped themselves open and it flipped up like a roller blind,” she confessed.

The “Pot-au-Feu” star recalled that she felt it would be inappropriate to adjust her garment in front of the Washingtons, so she “quietly panicked” instead.

“Walked out onto the biggest red carpet of my life and whispered to Keanu and Robert Sean Leonard what had happened. In this picture I am holding the front gusset down and the two of them are holding the back gusset,” Beckinsale continued.

“Absolute legends who may not even have fully understood the physics of what was happening or even heard the word ‘gusset’ before, but both jumped in to save me no questions asked x.”

The Post has contacted Beckinsale, Reeves, and Leonard for comment.

Beckinsale’s most recent Cannes appearance sparked plastic surgery accusations from fans — which she sharply denied.

“No threads no thread lift no Botox no laser no nose job no filler,” she responded to a fan on Instagram who swore Beckinsale had a facelift “because it’s not possible to be this gorgeous at 50.”

She added that she gets “facials with prp to boost collagen and micro current for skin tightening and oxygen.”

“I probably would try laser but I’m a bit scared. Haven’t so far,” she revealed.

One commenter didn’t buy that explanation and asked why celebrities “deny their face procedures.”

“I haven’t had a facelift or filler or Botox. I’m not lying and I don’t have to accept people accusing me of things I haven’t done,” Beckinsale doubled down.