One whiff takes us straight back to the noughties!

(Image via Tyla.com)

A perfume expert has revealed why we all love Britney Spears' 'Fantasy' - and it's so fascinating.

TikToker @renzephyr is a perfume expert who explains the scent in detail.

@renzephyr Reply to @flop_from_the_future Fantasy #britneyspears #celebperfume ♬ original sound - Fragrance Nerd

The expert explained the gourmand fragrance is fruity, and also has notes of white chocolate cupcake, kiwi and litchi.

He further explains that these notes remind adults of childhood memories and they tune into what younger people really like.

But cleverly, underneath there is jasmine, musk and orris, which older people key in as more mature smells.

The video turned so popular that the TikTok user had to make a part two to explain more to viewers.

@renzephyr Reply to @emmafry596 #Fantasy from #britneyspears part two appreciation of #economics #perfume P1 > @renzephyr ♬ original sound - Fragrance Nerd

Viewers took to the comments to show their love for the scent.

"Fantasy was my first ever perfume and honestly still love it 13 years on," said one person

Another added, "YESSS I love this perfume so so much."

A third said, "This was my wedding day scent almost 12 years ago."

One person said: "Yeah it's been my perfume since since teen to now my thirties I always get compliments when wearing it must admit it has changed over the years a bit."

On the other hand one person wrote, "I worked in Claire’s when they sold this stuff and yeah we had to take the sprayer off… oh the headache."