Billie Eilish has caused such a storm with her acting debut in Donald Glover's new series Swarm (little rhyme there), that natch' had to remind us all she is still first and foremost a musical genius and superstar. Performing at Argentina's Lollapalooza festival in Martínez, the musician took to the stage wearing an absolute classic primary school hair style and made it look impossibly cool.

Her choppy black tresses – recently cut into the trending 'Jellyfish haircut' – were fastened into two simple plaits coming down just past her shoulders, and they were definitely more dishevelled 3pm vibes than school drop off.

Leaving out her full fringe and long face-framing bangs, the plaits were coming out from under a backwards baseball cap, taking the playground nostalgia up several more notches.

While the rest of her makeup was minimal, dark smoky liner framed her pale blue eyes for a dose of her trademark grunge, which when paired with the thick chains and fishnets, kept the look far from school girl.

Later in her set the hat came off and the hair came down (really big day on the playground?), giving a more stripped back and serious look for the latter part, and really showing off that long grown-out fringe across her eyes. While it might impair vision slightly, it looks seriously cool.

We're tempted to have a go at reviving the hairstyle ourselves, though it would take some careful outfit planning to make sure it looks Billie and not... Pippie.

Everyone's clicking on...

(Long-stocking.)

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Elena Chabo
Former Beauty Writer

Elena Chabo is Cosmopolitan UK's former beauty writer, working on everything from buzzy celeb news and trending beauty, to sincere first-person reviews and engaging video content for social media. She also creates meatier features and expert-led how-to guides, for print and online. Her passion for Black beauty, textured hair, and the ways beauty interacts with culture, society, identity and relationships, quickly took over her writing career and led her into beauty journalism. Following an MA in Magazine Journalism in 2017, she cut her teeth across various roles at Stylist Magazine, before taking on a Digital Writer role at Good Housekeeping. It was here that beauty took centre stage and she launched and ran the site's first stand-alone beauty section. Remaining at Hearst, she joined the Cosmo beauty team in 2022. Find her on LinkedIn.