There's an easy, cheap trick to make your hair look thicker than it is.

Unless you were born with naturally mermaidesque hair, you’ve probably spent a little time Googling ways to make it thicker.

Although science is yet to product a magical supplement that guarantees a Blake Lively mane, there is a simple trick that’ll at least give the impression of a fuller head of hair.

And the one tool you need is probably sitting in your makeup bag as we speak. It’s eyeshadow.

Wacky as it sounds, applying eyeshadow to your part line can give you thicker-looking roots. — and hair professionals swear by it.

YOU KNOW EYESHADOW ISN’T JUST FOR YOUR EYELIDS ???? Ok so give this technique a go for those of you that have either a super iridescent scalp, or the other reason I love this is that it makes even the finest of hair strands appear thicker on the roots & hairline so your scalp doesn’t appear like your strands are lack luster nor thick…….. (Yes I know cheeky right) ???? I also do this quiet a bit when, I’m doing tight #Cornrows & #Braids???? You don’t need to purchase a @tomford #Eyeshadow palliate by any means & opt for a @revlonanz one for example that does the trick for me always. Take a look at the part line , I’ve left half untouched so you can all see the quick difference it makes. Alright girls that’s my Wednesday’s tip for you & have fun painting on your eyeshadow ????

A photo posted by A N T H O N Y N A D E R (@anthony_nader) on Jul 12, 2016 at 9:45pm PDT

Top Sydney hairdresser Anthony Nader, from Surry Hills salon RAW, demonstrated the tip on Instagram last week with an upcoming Revlon palette.

Nader says he also uses it to disguise a client or model’s exposed scalp, whether it be from a part line or a tightly-pulled hairstyle.

“If the scalp is too iridescent and stark white and your hair’s shade is dark brown or black it can look a little, well, too much of a contrast,” he tells Mamamia.

“If I’m doing tight cornrows or braids, you tend to see ‘more’ scalp than normal, and therefore you could tend to look more bald.”

Watch: Speaking of, here’s how you can recreate Kim Kardashian’s Dutch braids. (Post continues after video.)

You don’t need to be a trained stylist to pull off the technique — Nader says you simply need to lightly pat the colour onto the desired area using the eyeshadow brush. Start lightly, and go from there.

Obviously this trick is well suited to brunettes, but anyone can get in on the action.

It all comes down to choosing shadow that matches your strands.

“If you have blonde hair and you’re playing around with tight-to-the-head shapes, there’s no reason why you can’t use a lighter blonde palette either which is what I do,” Nader says.

“Don’t go busting out on an expensive palette, either, as there’s no need.” (Post continues after gallery.)

Obviously colour selection is crucial here, but you also want to be mindful of the eyeshadow’s ‘finish’.

“Remember, you want a palette that is flat and not shiny. Oh, and hold off on the glitter and sparkles for now, otherwise the vibe from here on in will be ’80s disco,” Nader advises.

Look, if you’re going for the glitter roots look you’d be better off hitting up a craft store.

If you need any further convincing, even the Kardashian family’s stylist uses eyeshadow as a hair tool.

Look closely... (Image: Getty)

Jen Atkin applies the pigment to Kim and co.'s hairlines to create a fuller look.

“Filling in your hairline is not any different than filling in your brows. It acts like a frame to your face, making your features look more balanced,” New York hairstylist Kat Zemtsova told Marie Claire last year.

Eyeshadow, you over-achiever, you.

Do you have any unusual makeup hacks?