BILLIE Eilish has left fans stunned after sunbathing in a revealing bikini top.

A friend and collaborator of the multi-Grammy award winner shared the snap from a day of fun in the sun.

Billie Eilish smiled in the sun in a plunging bikini top Credit: Instagram/ annabelzimmer

The singer typically wears big, baggy clothing Credit: Getty

Billie made the guest appearance in artist Annabel Zimmer’s personal photodump on Instagram.

Mixed in among various shots of and from composer Hans Zimmer’s daughter was one of Billie outside.

The 21-year-old smiled as she tilted her head towards the shining sky.

The singer had a pair of black sunglasses on, but fans were looking further down.

Billie wowed in a plunging bikini top from designer Miaou that she nearly spilled out of.

FAN FRENZY

In the comments section, fans went wild.

“… I am not breathing right now,” one person said, as another echoed: “I cant breath!”

A third added: “Imagine being this sexy.”

While a fourth shared an apology to the picture’s poster, Annabel

“Sorry that all us Billie fans are intruding your comment section,” the user said. “We are currently dying.”

BILLIE ON BLAST

Billie is no stranger to shocking fans online, and even personally slammed one for criticizing her recent work.

In a TikTok video, a shocked, wide-eyed Billie stared into the camera while a mean comment she’s seen going around was shown in the middle of the screen.

The rude comment she had been seeing all over her social media said: “Is it just me or is Billie in her flop era? Like why does she suck now…”

The blonde singer just sat there laughing and rolling her eyes and covering her face with her hand as her song NDA played in the background.

“Had a pretty boy over, but he couldn’t stay,” she sang on the song. “On his way out, I made him sign an NDA.”

While she let her hit track do all the talking for her in the video, Billie added another diss to her haters in the caption, writing: “literally all i see on this app… eat my dust my t*ts are bigger than yours.”

Previously known for keeping her body covered up in baggy clothing and trying to keep conversation away from her figure, Billie has been shocking fans with her recent change in behavior and style.

In her Lost Cause music video, Billie wore nude shorts and a T-shirt from Kim Kardashian’s SKIMS shapewear line, as did the group of girlfriends who starred alongside her.

She also showed off her curves in a low-cut pink corset on the cover of an issue of British Vogue.

Billie previously clapped back at one critical fan who claimed she was in her ‘flop era’Credit: TikTok

The TikToker went off on Billie’s recent work Credit: TikTok

Billie is a multi-time Grammy winner Credit: Getty