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Kate Middleton's favorite lengthening and volumizing mascara is just $24 at Amazon

It's always disappointing when the mascara you pick up promises to volumize and lengthen lashes, only to leave clumpy and limp hairs. If you're tired of buying — and quickly throwing out — new ones, call it quits and try out Lancôme's Hypnôse Mascara. It's a favorite of royals like Kate Middleton, who can afford the most expensive beauty products, but it costs as little as $24 on Amazon.

The formula lengthens and volumizes with each stroke. Plus, it goes on clump-free and leaves lashes with a defined finish.

$24 at Amazon

Kate Middleton's signature (and effortless) smokey eye look reportedly comes from Lancôme's mascara. And it's no surprise why. The formula is luxurious and provides buildable coverage that lifts, lengthens and volumizes lashes instantly. It comes in three shades: black, brown and extra black. The extra black shade gives a dramatic boost to your eyes without smearing and clumping.

The wand is also worth chatting about. It has an oversized brush that works through each lash to separate and deliver a smooth and even coat to each strand of hair. And if you need to add additional coats, the brush helps the formula go on clump-free.

Kate Middleton's favorite mascara is on sale at Amazon
Kate Middleton's choice of mascara? Lancôme's Hypnôse Mascara — get it on sale now. (Photo: Getty)

The Princess of Wales isn't the only fan. One reviewer said that the mascara is "perfect for long lashes that lack fullness." They also added, "That being said, the product adds terrific volume and dimension to your lashes. My annual mascara splurge!"

The Hypnôse Le Noir Elixir is even a good match for those with sensitive skin and allergies. Multiple shoppers report that the formula's high-performance ingredients don't cause their eyes any irritation.

"This mascara is a really good product," wrote a pleased mascara user. "Every mascara I have been trying makes my eyes burn, but this is gentle on my eyes. I have to hand it to Lancôme, for living up to their reputation by only using high-quality ingredients. Easy to apply, and results of lengthening happen right away. You do not need to use a ton of the product to get the length and some thickness. Worth paying more for."

"I've been using this mascara for over 18 years now!" exclaimed a loyal fan. "During that time, I've tried a few different brands but was never happy with any of them. I've tried many mascaras over 40+ years, and this is my favorite and the only one I will purchase."

Royals and shoppers both rave about the mascara.

$24 at Amazon

If you have Amazon Prime, you’ll get free shipping, of course. Not yet a member? No problem. You can sign up for your free 30-day trial here. (And by the way, those without Prime still get free shipping on orders of $25 or more.)

The reviews quoted above reflect the most recent versions at the time of publication.