While we've noticed that Taylor Swift's hair has slowly but surely become less blonde and has varied up and down the blonde-ometer before, Selena Gomez' long blonde hair, on the other hand, was a real major moment in the world of celeb hair transformations.

But maybe we didn't realise how light she went? Or maybe she's gone even lighter? Lo and behold in her birthday bestie selfie with Taylor, the pair have, literally, the same hair colour. And what lighting could make Taylor's hair darker and Selena's lighter?

a couple of women taking a selfie
Courtesy of Selena Gomez//Instagram

We're brain-boggled. When did this happen? Have they been inching down the colour scale towards each other without us noticing till they converged? Did they just dye their hair more together? They're such an iconic 'blonde and brunette bestie' pairing, it feels like all of a sudden, Blair and Serena's hair just morphed into one halfway through an episode of Gossip Girl.

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Investigating their new biscuity blonde twinning further, this paparazzi shot from the night before shows these two have somehow ended up with the same hair colour. While she has a darker root (natch), Selena's blonde may even be a touch brighter. Though it probably only looks that way as Taylor's is in a bun with the lightest part of her hair all tied up.

selena gomez and taylor swift papped in new yorkpinterest
Raymond Hall//Getty Images

It feels like some puzzle or riddle because looking at each separately I still don't see it. And side by side? Bam. Magic.

Clearly, Selena has made the more drastic change for them to reach this point, and what says BFFL more than dying your hair to match your friends on her birthday?

Headshot of Elena Chabo
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.