SHE'S got her own skincare and make-up company, designed to "give an instant dewy glow".
But Hailey Bieber doesn't always rely just on her Rhode Skin products to get her catwalk-ready look.
In fact, one of her go-to products is a £4 lipliner that you can grab on the high street.
In a promoting Rhode Skin's Strawberry Glaze Peptide Lip Treat, mum-to-be Hailey showed how she used lipliner to outline her pout.
Once she'd overlined the lips, she added the balm to the centre - giving her pout a plump, full look.
And people in the comments section were quick to spot that the liner Hailey used was NYX's Slim Lip Pencil, in the shade Nude Truffle.
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"I love you for this!" one person commented on the video.
"Love NYX liners - I use that one too!" another added.
"NYX liners are the best," a third commented.
"The lip liner's gonna be sold out everywhere now!" someone else said.
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And the positive reviews kept on coming on the , where the Slim Lip Pencil is available in 14 different shades.
"My make-up routine consists of mascara, blush, and highlighter, lol," one wrote.
"I thought i’d try something a little different and after trying other lip liners: this is the answer.
"I use the natural colour, and it works amazingly with my everyday look.
"It doesn’t smear, but it is easily removable at the end of the day. I don’t find myself having the reapply every time I eat or drink; it lasts pretty much all day."
"I have a bunch of these in different colours and often repurchase my favourites," another added.
"I love that it is the only product that stays all day, even longer than any lip stain."
"Easy to use, glides on without smearing and it lasts," a third praised.
"The colour is vibrant and versatile."
Hailey Bieber's go to make-up products
SHE regularly appears on 'world's most beautiful' lists. But what products does Hailey Bieber swear by to get herself catwalk ready?
BASE
Kosas Glow I.V. Vitamin-Infused Skin Enhancer
Hourglass Veil Hydrating Skin Tint Foundation
Chanel Ultra Le Teint Foundation
Kosas Concealer
MAKE Beauty Concealer
Huda Beauty Easy Bake Loose Baking & Setting Powder
Kosas Cloud Set Setting Powder
Laura Mercier Translucent Loose Setting Powder
CONTOURING
Milk Makeup Liquid Blush
Merit Beauty Blush
Dior Backstage Rosy Glow Blush
Tom Ford Shade and Illuminate Cream Face Palette
EYES
r.e.m. beauty Eyeshadow
RÓEN Mood 4 Ever Palette
Hourglass Glitter Eye Shadow
KVD Beauty Tattoo Pencil Eyeliner
Hourglass Unlocked Instant Extensions Lengthening Mascara
MAC Cosmetics Extended Play Gigablack Lash Mascara
BROWS
Anastasia Beverly Hills Brow Gel
Milk Makeup Kush Fiber Eyebrow Gel
SETTING SPRAY
Milk Makeup Hydro Grip Dewy Long-Lasting Setting Spray
"These lip pencils come in a wide variety of colours and are very affordable," someone else said.
"You honestly can’t go wrong with these."
"I love this NYX lip liner!" another commented.
"It has a great consistency that doesn’t flatten quickly with use or break off after sharpening.
"I love the colour Nude Truffle. It works well with most lip colours and stays on throughout the day.
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"I even like using as a base prior to applying my lip colour.
"I hope they never stop making this product! Great price too!"