As the face of Dolce & Gabbana, Scarlett Johansson must pay big bucks to keep her mug flawless. Or that's what we assumed. As it turns out, the "Don Jon" actress' beauty secret costs just under five dollars.

Johansson opened up about her skincare obsession in the February issue of Elle UK and confessed that she washes her face with -- wait for it -- apple cider vinegar. The common household product is what she uses to keep her porcelain complexion in check and camera-ready.

"A while back, I started researching natural skincare," she told Elle UK. "It's a nice way to treat your skin if you don't want to use all those harsh chemicals that a dermatologist would recommend."

Turns out the acidity of apple cider vinegar balances your skin's natural pH levels and restores your luminous glow much like toner.

Johansson adds, "If your skin is problematic or you're having a lot of breakouts, it's really healing. It's a little bit stinky but if you're not sleeping over at your boyfriend's, it's really effective!"

Maybe Scar-Jo should reconsider a career in dermatology, as she's serving some spot-on advice. Apple cider vinegar actually has endless beauty benefits: You can use it as a DIY hair rinse to remove dirt and add shine, or use it to treat warts and nail fungus, soothe sunburns, and soften calloused skin.

Have you used apple cider vinegar on your skin? We've certainly heard of weirder ways to treat acne. Tell us your thoughts in the comments section.

Meanwhile, see Scarlett flaunt that gorgeous face on the red carpet:

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