KIM Kardashian has shown off her six-pack abs wearing only a bra and leggings.

The reality star showed off her shrinking waistline while promoting her Naked bra series for her SKIMS collection.

Kim, 41, posted a video to her Instagram page modeling the new line.

In the video, Kim wears a long black bra and matching leggings.

She speaks directly to the camera saying: "Also from the naked collection, I'm wearing our scoop tank.

"It kinda feels sports bra-eee, but really thin, and like a tank. But I always need to wear a bra, and with this, this is the bra."

Fans could make out Kim's skinny frame, after she's undergone a dramatic weight loss this past summer.

Kim has recently shown off her shrinking waistline at events in Milan, Italy and New York City.

Kim has recently sparked concern with her shrinking figure as fans think she might have gone too far.

In May, the former E! star received backlash from fans when she admitted to losing 16 pounds in three weeks in order o fit into Marilyn Monroe’s iconic dress for the Met Gala.

She clapped back at critics about her weight loss and insisted that she had done the transformation in a "healthy way."

“If I was starving and doing it really unhealthy, I would say that, of course, that’s not a good message," the star told Allure.

"But I had a nutritionist, I had a trainer. I have never drunk more water in my life."

Kim recently showed off her skinny waist and breasts in a barely there outfit on social media.

The Hulu star paired a revealing bra with a giant diamond choker and high-waisted leather pants.

While the reality star looked stunning, her critics claimed it looked like she has had implants.

Sharing a snap from the shoot on Reddit, one claimed her recent drastic weight loss made her rumored boob job more obvious.

They wrote: "All that weight loss exposing her implants."

Another added: "Agreed. Did she get them redone to match her weight loss? Or did her fat loss just hollow out her chest area?"

A third posted: "It's like tiny chest and then those huge implants."

This isn't the first time Kim has faced speculation over her generous cleavage.

Last month, fans thought she might have accidentally revealed she'd had a boob job while sharing a scan of her body.

In the scan, there are two clear white circles where Kim's boobs are - which fans thought could be a sign that she's got implants.

One shared the scan on an online thread and explained that "anything white is something the machine read as very dense."

Earlier that month, her followers speculated that she'd had a face lift after spotting what looked like scars next to her ears in her daughter North's TikTok.

In July, the Hulu star denied getting any surgery on her face and insisted she has only ever had Botox.

During an interview with Allure, the mother-of-four claimed she has had a little bit of Botox on her forehead.

Kim went on: "I’ve never done anything. I have a drop of mascara on today. I’ve never filled my cheeks. I’ve never filled my lips.

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