The America's Got Talent starlet ditched the foundation and mascara whilst indulging in a pamper session with Spice GIrl and fellow judge Mel yesterday (26 August).
And it looks like both ladies had been battling tired, puffy eyes as they soothed their peepers with an under eye treatment.
Alongside her picture Heidi tweeted: "eye treatment! you wont recognise us tomorrow night on AGT."
So that's their secret!
Now we reckon their eye patches are probably pretty pricey, so we'll be trying the Puffy The Eye Bag Slayer Wake-up Under Eye Patches, £6 for three by Anatomicals, instead.
They promise to relieve dark circles, reduce puffiness and help prevent signs of ageing. And you can even keep them in the fridge for a souped-up eye treat.
Supermodel peepers, here we come!
Have you tried an under eye patch treatment? Let us know by commenting below as the best comment across the site each week wins £50!