Which Sexpot Celebrity Posted This #TBT of Her as a Tomboy?

You'll never guess which celebrity posted this blurry but totally awesome #tbt photo of themselves to Insta as a tomboy. Go ahead, you can guess out-loud at your screen now.

No, not Ellen DeGeneres. No, not Jane Lynch either. They didn't rock this pretty sweet look until their twenties.

This adorable ghost of Tomboy's past is none other than Mad Men star January Jones.

WHOA.