Billie Eilish stunned unassuming passengers on a commercial airline by opting to fly in economy class.

Despite a vast net worth of $30 million, the hitmaker, 21, scrimped by boarding the basic flight, with the journey caught by an excited fan with the username @williambossanova.

The fan quickly took to TikTok and shared a recording of Billie seated several rows ahead, with Billie, who recently showed off diamond grills. easily visible as she wore a gray beanie with white-outlined blue stars all over.

Billie later took to Instagram Stories to share a snap of herself on the flight, sporting the same laid-back look.

The overhead cabins of the aircraft were visible in the background, and she linked the Future song I Serve The Base over the image.

Nothing fancy! Billie Eilish stunned unassuming passengers on a commercial airline by opting to fly in economy class

The fan who posted the sighting on social media has gone viral, with the clip viewed close to 900,000 times.

The caption of the post read, ‘Pov: you’re in a plane with Billie (Still cant believe wtf just happened).’

And across the recording was a similar caption that said: ‘POV: you see Billie Eilish for free.’

Billie is set to perform at Reading and Leeds Festivals in the UK this weekend, so was no doubt jetting to the UK ahead of the shows.

The star will join Sam Fender, The Killers, The 1975, Foals and Imagine Dragons as the headliners for this year’s event, and will perform at Leeds on Friday, following by a Reading set on Sunday.

Last week the Gen-Z favorite took the stage at Sziget Festival 2023 in Budapest, Hungary.

She flaunted her fun sense of fashion as she performed in a black Jersey with white and red accents, red athletic shorts, and black tights.

One of the Grammy winner’s recent Instagram posts showed her with new diamond grills adorning her teeth.

Over the moon! Despite a vast net worth of $30 million, the hitmaker scrimped by boarding the basic flight, with the journey caught by an excited fan who posted footage on TikTok

Look who it is! The fan quickly took to TikTok and shared a recording of Billie seated several rows ahead, while also spotting her as she prepared to board the plane

Exciting! Billie is set to perform at Reading and Leeds Festivals in the UK this weekend, so was no doubt jetting to the UK ahead of the shows

Fun fashion: The entertainer recently performed at the Sziget Festival 2023 in Budapest, Hungary after recently unveiling her divisive diamond grill

Diamond grills: The star flaunted her look in a close-up selfie as she sported a graphic T-shirt and an orange hat

Storming the stage: Becky Hill took to the stage on Friday at Leeds Festival

Born performer: She wowed in a blue star print silk dress as she performed her hits

The photos prompted a debate among her 110 million followers, as some thought the accessory was cool, and others disagreed.

Social media users wasted no time taking to the comments section to offer their contrasting takes.

One fan defended the grills, and wrote, ‘It’s obviously Hip-Hop influenced. She’s always done the big clothes, but let’s not stray from the fact that the jerseys, Jordans, and grills are common hip-hop troupes.’

Eilish has been filtering through a busy schedule, and aside from headlining Lollapalooza earlier this month, she also released a new music video for her track, What Was I Made For?, from the Barbie soundtrack last month in July.

At the time of the vide drop, she took to Instagram and gushed, ‘”What Was I Made For?” our barbie song (& video) is out now. :’) in january greta showed me and finneas a handful of some unfinished scenes from the film.’

She added, ‘we had nooooo idea what to expect at ALLL… we were so deeeeeply moved.. that the next day we were writing and COULDNT shut up about it lolll andddddddddd ended up writing almost the entire song that night.’

‘to be real with you this all seemed to happen in a time when i really needed it. i’m so so thankful for that. this video makes me cryyyyy.. it means so much to me and i hope it will mean just as much to you.’