Supermodel Cindy Crawford has been an icon in the fashion industry for decades. She has even managed to raise two gorgeous children who are also making waves in the modeling world. And Crawford certainly knows where to spend most on the beauty aisle: "Anything that goes on your skin. So skin care and foundation," she shared to Byrdie. "You can get a less expensive mascara, you can get a less expensive lip gloss or nail polish, but anything that's actually on your skin is worth investing in. I don't ever want to look like I'm wearing makeup. I'd rather people be like 'You look great,' or 'Your skin looks great,' not 'Your makeup looks great.'"

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Supermodel Kate Moss admits her own daughter knows more about beauty than she does: "She's into natural, organic. Now, she's into mascara and beauty blogs and stuff," she joked to W Magazine. On her own though, Kate practices beauty from inside out by juicing intermittently throughout the year. "At least three times a year, for a week, I do a juice cleanse. I like it. I feel amazing. And then I have so much energy! Everyone else is like, 'Please...shhhh...' Oh my god, I have so much energy start bouncing off walls."

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Victoria Beckham is quite the busy mom, running a household of four kids all while keeping up with her very own fashion empire. That said, even with her hectic schedule, she still takes time for some DIY self care. "You can make your own face mask," she explained to Elle. "I learned this in LA: you mix manuka honey with organic oatmeal and egg white. Mix it all together and put it on your face for a few minutes, and it's amazing. But it's got to be manuka honey, not regular honey. And it's got to be organic oatmeal."

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J-Lo is all about the glow. Her makeup artist Mary Phillips dished the details to Well + Good: "She is a fan of Själ's Saphir Concentrate, a facial oil that not only contains aquamarine — the stone of eternal youth — but also botanical retinol, soothing blue chamomile, and a biomarine complex." At $175 a pop, it's certainly pricey, but hey — it seems to work.

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Kim Kardashian-West's makeup is always flawless but it all starts with good skin care. One of her must-haves? Retinol. "To combat wrinkles, you should begin using products that contain retinol," she explained on her app. "When using a retinoid, you must wear sunscreen every day. And, because the skin around the eyes is the thinnest and first to show signs of aging, it's also important to introduce a moisturizing eye cream to your skin regimen."

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