As you do.
The Keeping Up With The Kardashians star was Snapchatting away while getting a relaxing head massage from model pal Hailey Baldwin but it was cut short as the pair discovered a single grey hair hiding amongst Kendall's bobbed brown locks.
Eeek - we all get 'em!
Kendall - who was less than impressed at the unwelcome discovery - yelled, "Just pulled this hair out of my head and we can't tell whether it's grey or blonde!"
She turned to Hailey and screeched, "It's blonde right? It's blonde right?!"
The Kardashian-Jenner crew have switched up their locks more times than we can count this year and in March Kendall went blonde for Balmain's Paris Fashion Week show - so the 'grey' hair could in fact be a rogue platinum strand...
...that said, grey hairs (yep, even in your twenties, girls) are unavoidable, although we wouldn't suggest yanking them out a la Kenny - er, ouch.
In other KJ news, the model of the moment drew gasps when she stepped out in New York yesterday wearing a completely see-through top that put her boobs (and her nipple piercing) on full display!
Kendall, out with BFF Gigi Hadid, wrote in a recent blog post on her website and app, "I just [like] showing my nipples through some of my outfits [...] There's something understated, yet sexy about it."
You can't knock her confidence, right?
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