And it's neither an eye-wateringly expensive facial, nor a super-pricey face cream that's infused with diamonds, 24k gold and unicorns' tears (if only such things existed!).
Instead, it's a simple, DIY cloth face mask that's out there on the high street for all of us to enjoy. Yesss!
Frankie took to Instagram this weekend (30 July) to snap a skin selfie while pampering her face in the bath...
"Looking hot!!" the former Saturdays singer posted.
And quite honestly, even sporting a cloth, Hannibal Lecter-like face mask, Frankie still does look totally hot.
Sigh. Skin envy right there.
Frankie showed off her bare-face beauty a few weeks ago, when she posted a selfie with hubby Wayne as they toasted a spa day while celebrating their two-year wedding anniversary.
And now we know how she achieves her clear complexion – by looking after her skin in the comfort of her own home. Smart cookie.
We also love a sheet face mask here at Reveal HQ and often find ourselves pampering our skin of a 'school night.'
Here are our current three faves:
1. Maskeraide All Nighter Hydrating Sheet Mask, £5 each, asos.com
Perfect for the morning-after, when skin needs an instant pick-me-up and an added hit of moisture.
2. Skin Republic Spots + Blemish Sheet Mask, £4.99 each, superdrug.com
Tea tree oil, witch hazel and salicylic acid combine in this deep cleansing treat for oily or problematic skin.
3. Masque Bar Green Tea Sheet Masks, £9.99 for three, boots.com
Brighten a dull complexion and help fade dark spots with this pack of three skin-boosting masks.
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