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 January Jones

Fame Pictures

It's certainly a mystery for the ages—at least, the digital ages—who is the father of January Jones' son?

Well, we got one giant step closer to discovering that today, as the birth certificate of Xander Dane Jones has been released. And while the Mad Men star is obviously listed as the mother, who's name is right alongside hers as the coparent?

No one's.

That's right, don't go handing out those cigars just yet, because the ever crafty Ms. Jones isn't giving away the game that easily, and the document, filed Friday with the Los Angeles County Department of Public Health, was left completely blank in the spot that asked for the father's name.

Oh, she's good.

January has been keeping extremely mum on the subject of her baby daddy both before and after Sept. 13, when her bundle of joy came into the world.

Oh, well, mom and baby may are healthy and happy. And for now, Xander's the only man in January's life that we're gonna know about.

—Reporting by Claudia Rosenbaum