Kate Middleton wears hairnets to keep her updos in place -- and you may have never noticed

Now, we're not about to announce breaking news or anything -- but we had never noticed this (we're pretty disappointed in ourselves), and we want to keep you informed. Wait for it.

Kate Middleton wears hairnets to keep her perfect updos in place.

If you happened to catch photos of the Duchess in the Netherlands Wednesday (or if you heard about her plane surprise), then you also saw her impeccable chignon (and maybe wondered how she kept it so impeccable).

If not, take a look for yourself:

Pretty flawless, right? And as Cosmopolitan suspects, it looks like she has a hairnet to thank again.

Still have doubts? Here's a closer peek:

Her trick was first noticed this past summer when, according to the Daily Mail, everyone started clamoring for old-fashioned hairnets after the royal mom was spotted wearing one in France.

We're guessing the demand just skyrocketed again. If you're in the market for one, Amazon has quite the selection.

Can't get enough of Kate's style? See her transformation through the years below: