WE'VE all been there - you're on the hunt for a new foundation but have absolutely no idea what shade you are.
So naturally, the first step is to head to your local make-up counter and start smearing testers all over your hands before turning to an expert for help.
That said, one American beauty fan would have been better off colour matching herself after a sales consultant sold her a very unflattering yellow foundation - but insisted it was her "perfect" shade.
Posting a photo of the beauty mishap on social media, the woman - who uses the Twitter handle The Funny Muggle - wrote: "GUYS I'M DEAD.
"I went to Ulta to buy a new foundation and the girl that helped me said, 'oh yeah - it matches your skin PERFECTLY.'"
But despite her best efforts to convince the woman that it was an unnoticeable colour match, it wasn't until the shopper left the store that she realised her face was actually yellow - and a very noticeable shade of yellow at that.
Since it was shared on Twitter earlier this week, the shopper's post has since racked up over 112,000 "likes".
While one user argued that the sales assistant must be "colour blind", another wrote: "She did you dirty."
A third pointed out: "Too yellow. You're more pink. And it gave you wrinkles you probably don't even have."
However, another argued that it might have been a "perfect" match under the fluorescent store lighting.
They replied: "You shouldn't trust foundation in store lighting. Maybe it did match you in the store.
"Next time try some shades. Walk out and use a compact mirror to see the shades in natural lighting."
Unsurprisingly, the viral post encouraged others to share their own hilarious experiences of mismatched foundations.
Sharing a photo of her orange, streaky layer of make-up, one Twitter user replied: "If it makes you feel any better, someone in Sephora matched me with this."
Here's hoping they didn't actually buy the foundation...
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