Kim Kardashian’s fans were astonished to see her wearing no make up when she was a guest on an online makeup tutorial.

Make up expert Mario Dedivanovic took on the challenge of transforming 42-year-old Kim into her usual glamorous self.

But this involved starting with a blank canvas – meaning fans were shown ‘confident and single’ Kim sitting patiently in a make-up chair without any make up on her face.

Mario then set to work – and shared a video of his efforts

that was uploaded to the official SKKN Instagram page.

The video was shared along with the caption: “The secret to @kimkardashian’s dewy glam? Start with a luminous base using the technique she taught @mariodedivanovic: combine Face Cream and Oil Drops.”

Kim Kardashian was make-up free as she joined a friend for a make-up tutorial ( Image: Instagram)

Fans were stunned to see the star without any make-up on ( Image: Instagram)

Footage showed Mario getting to work.

He began: “Hey guys. I have a special guest today – the one and only. The OG. So stay tuned.”

He sounded excited to introduce Kim who beamed at the camera as she was revealed – with her hair loose around her and she was sitting in a cream chair wearing a simple black dressing gown. Mario went on to explain he was stripping off all of Kim’s make-up to give them a fresh canvas for him to apply “full glam” make-up.

He started off applying some toner and was then shown applying some SKKN Face Cream, mixed with SKKN Oil drops, to Kim’s cheeks and nose.

He suggested fans could replicate the treatment to create a base for makeup.

Mario went on to give Kim’s eyebrows more volume by filling them out by using a Master Blade Brow Pencil, using “the shade classic brunette”.

Foundation was the next product to be used – and liberally so – across the reality star’s eye lids and going on to add subtle smokey eye makeup.

During the course of the tutorial Kim chimed in at one point, saying with her famously nasal tone: “Yesterday was mine and Mario’s 15 year anniversary from the day we met.

“He sent me flowers.”

Mario revealed: “She sent me a cake.”

Fans were most impressed by the fact that Kim allowed herself to be shown on camera without a scrap of make-up as the lesson began.

One gobsmacked fan commented: “She looks good without makeup.”

Kim later retired to her closet to try on swimwear ( Image: Instagram)

And another agreed, typing; “She looks so pretty and fresh without makeup.”

Hours later, Kim was posing in her closet showing off some of her latest swimsuit designs – she shared videos of herself wearing bright pink and light blue swimwear.