If you’re one of the 90.8 million people who follow Kylie Jenner on Instagram, then you’ve undoubtedly already heard of Fashion Nova, the Los Angeles-based fast fashion brand promoted by social media’s hottest stars.

Propelled by the likes of Jenner, Amber Rose, Cardi B., Dascha Polanco, Teyana Taylor, and an army of 3,000 to 5,000 amateur models called “influencers,” Fashion Nova has exploded to become Instagram’s biggest fashion retailer. CEO Richard Saghian refers to his company as a “viral store,” relying largely on the popularity of its celebrity and model influencers to spread word-of-mouth advertising to their followers.

Fashion Nova has also gained a reputation as a style refuge for fashion-forward plus-size women, who face myriad difficulties finding trendy clothing. Though the average dress size for American women is currently 16, many retailers still refuse to carry plus-size clothing in their stores. And plus-size retail giants, like Lane Bryant, have faced criticism for their lack of trendy styles.

Hence the fly-off-the-shelves popularity of Fashion Nova’s cute, trendy, celebrity-approved “Plus Size & Curve” section with curvy women — and the major backlash the brand faced just last week, when plus-size model Tabria Majors noticed that Fashion Nova hired thin, straight-size women to model its plus line on their website.

“@fashionnovacurve why do you use size 2 models to represent your plus size line? #questionsthatneedanswers,” Majors captioned her post, which has garnered nearly 15,000 likes.

“They don’t seem to mind using plus-sized girls on their Instagram to promote their line,” one commenter replied. “Something is weird.”

Majors agrees that something is weird, telling The Post that while Fashion Nova regularly recruits popular plus-size models for its Instagram influencer army, “they’re not willing to pay curve models the same rate as their straight-size models.” So they hire skinny models to promote straight and plus-size lines on their e-commerce website instead.

“The plus-size industry brings in so much money for these clothing brands, especially now since it’s so on-trend,” Majors continued. “Body positivity is massive, yet they’re not willing to compensate [plus-size] models for their brand. It’s sending mixed signals.”

Fashion Nova responded to The Post’s findings by saying they were “saddened.”

“The claims that Fashion Nova’s curve influencers are compensated differently are absolutely not true. We would like to emphasize the fact that we are never looking to discriminate,” they wrote in an emailed statement.

“The Fashion Nova brand as a whole believes that all women should feel both confident and sexy regardless of today’s body standards. Our curvy Nova Babes have always been re-posted on our @FashionNova page as well as our curve page. Unlike most companies, the same products that are offered to our straight size customers are also available to our plus size customers and we strongly believe that our clothing empowers women of all shapes and sizes. We launched our Curve line to become more inclusive with all of our styles and are actively strengthening the Collection. That will soon be represented on our website alongside the straight size models.”

The Post spoke to several plus-size models who work with Fashion Nova as influencers. A few seasoned negotiators make $100 to $150 per Instagram post (though Vice reports that some influencers make up to $2,000 per post), but many work solely for free clothing and the hope that prime placement on the brand’s main Instagram page — which boasts a whopping 7.2 million followers — will lead to more lucrative offers from other brands in the future.

“I don’t really care about the money,” one of the brand’s plus-size model influencers, who has an Instagram following of 250k and rakes in $100 per post on Fashion Nova, told The Post. “When other brands see I have a lot of followers, then they’ll reach out to me and ask how much I charge.”

Problem is, while Fashion Nova’s straight-size influencers all appear on the 7.2 million-strong main page, the curvy girls get shafted. Plus-size influencers are featured on Fashion Nova Curve, which only has 295k followers. Their photos are occasionally cross-posted to the main account, but you have to scroll through roughly three dozen pics of Kylie clones before reaching a single woman above a size 14.

“I hate how they have to make a separate Instagram for their plus-size line,” Majors said. “I don’t know why they can’t post them on their regular page. What are you really saying, here?”

Regardless of the significantly smaller rate of exposure, $100 to take a selfie in a free outfit, with added free exposure, doesn’t sound like such a bad deal. But as multiple influencers explained to The Post, there’s a lot more to it than that. Influencers are incentivized to post professional-looking shots thanks to a promotional code. This code offers discounts to the model’s followers, and also allows Fashion Nova to track her sales.

The model is not paid a commission on her sales, but the more a model’s code is used, the higher the likelihood she’ll be booked again — hence an impetus to produce high-quality photos with hair, makeup, and lighting on point: photos that will make her followers want to buy her clothing. One influencer, who makes $150 per post and asked to remain anonymous, told The Post that “if you include makeup, blogging [the outfit], and editing,” staging and shooting a Fashion Nova photo often takes up her entire eight-hour work day.

Consider that agency-backed models, like the ones Fashion Nova hired to model plus clothing on its e-commerce site, can get anywhere from $500 to $1,000 for that exact same work day — Stetts Model Management founder Ashley Stetts told The Post that Fashion Nova models likely pull in around $750 per shoot — and it’s easy to understand why models like Majors are growing tired of brands like Fashion Nova offering plus-size girls pennies in exchange for placement on a 295k Instagram page. Especially since, as one influencer explained, the plus-size items she promotes often sell out within hours, thanks to the aforementioned dearth of fashionable curvy clothing.

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“The reason why they hired the size-2 models is to save them money,” the influencer explained. “Rather than hiring more models for Curve, what they did was have the same people come in for that one photo shoot. But if plus-size models modeled straight-size clothing, [straight-size shoppers] wouldn’t take another look.”

So not only is Fashion Nova giving its straight-size influencers more prominent placement on social media, it’s also leaving plus-size models off its e-commerce website entirely — even though its plus-size influencers have undeniably boosted the brand’s popularity within the market.

Virtually all of the influencers who spoke with The Post still maintain that Fashion Nova is a “plus-size-friendly” brand, but its growing popularity hasn’t necessarily paid off for the curvier women promoting it — who are all very aware that there will always be another girl who is willing to model for free right behind them.

“I think they are plus-size-friendly,” one influencer concluded. “I just think that they’re cheap.”

This article has been updated to reflect a statement by Fashion Nova responding to The Post’s reporting.