flashes red G string in a figure-hugging dress ahead of her 40th ...

She has never been one to shy away from a revealing outfit. 

And as approaches her 40th birthday next week, it seems little is set to change in how she presents herself over social media.

The reality star, 39, donned a figure-hugging black dress that revealed more than a hint of her G-string in a snap shared with her 190 million Instagram followers. 

Wow! Kim Kardashian posed in a figure-hugging black dress that revealed more than a hint of her G-string in a new snap posted on Friday

Wow!  posed in a figure-hugging black dress that revealed more than a hint of her G-string in a new snap posted on Friday

Kim's killer curves were clear for all to see, as she posed with her back facing the camera and her head turned round in a fierce stare. 

The dress featured a huge cut-out design that revealed nearly all of Kim's back, at the bottom of which her striking red G-string was extremely visible. 

Kim's perfectly etched smokey eye and striking eyeliner accentuated her .

The mogul accessorised with a chunky gold necklace, as well has a large black leather handbag that hung loosely over arm.  

Revealing: The back of Kim's dress featured a huge cut-out design that revealed nearly all of Kim's back, at the bottom of which her striking red G-string was extremely visible

Revealing: The back of Kim's dress featured a huge cut-out design that revealed nearly all of Kim's back, at the bottom of which her striking red G-string was extremely visible

High voltage: As she approaches her fortieth birthday, it seems little is set to change in how the reality star presents herself over social media

High voltage: As she approaches her fortieth birthday, it seems little is set to change in how the reality star presents herself over social media

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Keep it classic like Kim wearing a Givenchy maxi dress

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Kim has long had a penchant for revealing G-strings: In 2018, she shared a striking snap of herself sporting a vintage Gucci thong from 1997. 

She was once again pictured from behind, wearing a tiny yellow crop top and matching bottoms.

Rising over the top of her yellow skirt was a whale tail, care of a stringy black thong with a metallic clasp at the middle.

But according to People, this particular G-string was not some limited edition designer item that's just hitting stores. In fact, the undies were from a Gucci collection that's over two decades old.

The thong first appeared in the runway as

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