Hailey Bieber called 'most powerful model in the world' as she helps Kim Kardashian sell new SKIMS bras like 'hotcakes'

is being called the 'most powerful model in the world' on social media, even eclipsing her best pal .

That is because the wife of helped sell out most of her new line for SKIMS in just days.

The 29-year-old cover girl posed in the Everyday Cotton line for the first time last week in a sizzling shoot by Mert Alas.

Soon after several of the items sold out and buyers had to be waitlisted.

Some fans took to Instagram to complain the bras and underwear went out of stock too fast. 'The bras I want in my size already sold out, OMG,' said one. 'They are selling like hotcakes!'

Another had a longer gripe: 'Hi! My order confirmation said it would ship within 1–2 business days, but it’s now been about two weeks and I haven’t received any shipping updates. Could you please tell me the current status of my order and when it’s expected to ship?'

Last year it was reported that Kardashian's SKIMS company is now worth $5 billion after a massive $225 million funding round led by Goldman Sachs. 

There were more comments on the look. 

Some said the images of Bieber reminded her of Megan Fox, who has also posed for SKIMS. 

And someone also said they wished Gigi or Bella Hadid would model for Kardashian next.

Others called Bieber a 'baddie,' and a 'queen.' There was even a remark to Justin: 'What an amazing wife you have.'

Plenty of the comments were gushing: 'Without a doubt, this was Skims’ most beautiful campaign. The way Hailey looks absolutely flawless is impressive — she is truly stunning.'

Then there was this fan: 'I’ve been influenced to purchase skims - omg I just placed the order!' 

But some seem to have grown tired of Kardashian's habit of using her sisters like Khloe, Kourtney, Kendall and Kylie as well as her pals like Brooke Shields to model her designs. 

'I’m over the endless celebrity collabs, sisters, besties, and billionaire circles selling to everyday people,' the critic said. 'The product used to matter. Now it feels like one big recycled hype machine.'

'For me, great basics are the foundation of every wardrobe,' Bieber said in an emailed statement to WWD last week.

'The Everyday Cotton collection has all the qualities I look for. It’s soft, comfortable and easy to wear no matter the occasion. These are the pieces I find myself reaching for again and again.'

Kardashian, Skims cofounder and chief creative officer, said Bieber’s cool personal style is what made her hire the model for the campaign.

'Hailey has a unique ability to make even the simplest pieces feel elevated,' Kardashian said. 'Her approach to style is effortless, which made her the perfect person to bring Everyday Cotton to life.'

Everyday Cotton launched in February with Kylie Jenner. The collection takes 10 of Skims’ most familiar bra and underwear silhouettes and remakes them in cotton.

The Everyday Cotton assortment is available through Skims stores and the brand’s website in sizes XXS to 4X, with bras offered in up to 38 sizes.