Whenever I use the bathroom at someone else's house, I can't help but look inside their medicine cabinet and take stock of the beauty products they use. It says so much about someone, doesn�t it? I realize it may not be the most polite behavior, but I have my beauty editor job as an excuse -- it's research!

So when I set out to ask five of the top natural experts in the beauty business for pictures of their makeup bags and medicine cabinets, I was thrilled to be indulging my (admittedly rude) voyeuristic tendencies. And thankfully, they were more than happy to oblige. They each sent a photograph -- which they took themselves -- giving us a glimpse inside their personal beauty stashes.

Skip ahead to see what these green beauty experts use.

While I'm curious about the products just about anyone uses, these experts are particularly fascinating. Each one is the founder of her own natural beauty line, and they all have a holistic, ecologically-friendly approach to beauty.

If you've ever wondered which natural products to try, who better to look to than the creators of natural lines? Of course they all use their own products first and foremost, but there are plenty of other brands highlighted here as well -- and that's the part that's really interesting. It's like finding out which toothpaste a dentist uses at home -- rather than the freebie products he or she stocks in the office. It's personal and honest -- and I didn't even have to sneak inside their bathrooms to get the information.

Skin care guru Tata Harper splits her time between her home in New York and a 1,200 acre farm in Vermont where she grows many of the ingredients used in her products. Since launching in 2010, Harper's line has become one of the most well-respected brands in the "green" market. Not only is everything completely natural, it really works -- and the line has legions of fans, from celebrities to estheticians to beauty editors.

Tata Harper sent us a photo of her makeup bag -- a 100 percent organic cotton pouch by fellow green beauty expert Christy Coleman. Of course, Harper keeps a few must-haves from her own line on hand (the Tata Harper Aromatic Stress Treatment, $80, and Tata Harper Improved Floral Essence, $65, an amazing hydrating mist), but we were surprised by how many other cool, independent brands she loves.

Her go-to makeup products are Revolution Organics Freedom Lip Gloss, Ilia Beauty Tinted Lip Conditioner, Kjaer Weis Cream Blush Compact, RMS Beauty Living Luminizer, Vapour Organic Beauty Mesmerize Eye Color and Nvey Eco Moisturizing Mascara. Her fragrance of choice is Tsi~La Organics Ilang Ilang Eau de Parfum. And she always carries a bottle of Intelligent Nutrients Certified Organic Hand Sanitizer -- a necessity when traveling around New York City. Even Harper's hair products are green -- she uses a sustainable Widu Wooden Bristle Pneumatic Oval Brush and Lulu Organics Jasmine Hair Powder. Her favorite place to buy eco beauty essentials is spiritbeautylounge.com, where most of these products can be found.

Supermodel Josie Maran founded her eponymous line in 2007. She was pregnant at the time, and frustrated by the lack of natural products available. After spending hundreds of hours having her makeup done for everything from runway shows to print campaigns, she used what she learned to develop products that are good for your skin and the environment -- and work just as well as conventional makeup lines.

Maran is now pregnant with her second child, and she uses many of her own all-natural products. Above all others, she's dedicated to Josie Maran Argan Oil, $48. "This is my miracle product," she says. "I always keep an extra just in case I run out, and I use it every morning and evening all over my face and body." Other essentials from her line are Argan Balm, Argan Hair Mist, Argan Oil Hair Serum, and the Whipped Argan Oil. (Clearly, Maran is the unofficial spokesperson for Argan oil.) She wears minimal makeup -- generally just the Josie Maran Color Stick in Rosey on her cheeks and lips. And her other beauty essentials come from Tom's of Maine: deodorant and toothpaste. As a mom, Maran always has bandages on hand: "I like the fabric ones because they are gentler on skin and more breathable. Plus, they're latex-free."