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Source: January Jones' Baby Daddy So Isn't Jason Sudeikis

The plot behind January Jones' mystery baby daddy has thickened.
/ Source: E!online

The plot behind January Jones' mystery baby daddy has thickened.

Although most recently linked to SNL actor Jason Sudeikis, January and Jason split in January (appropriately enough), and a most knowledgeable source tells us the funnyman is not the father of January's soon-to-be born kid:

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Dun, dun, dun!

According to very well placed movie insiders, closely connected to Jones (who's been shooting X-Men: First Class), January was involved with someone on set--and that someone is the father of her child.

Hmm, no wonder Sudeikis was so tongue-tied when a Washington Post reporter asked him at the White House Correspondent's Dinner if he had any comment about Jones' sudden baby bump, saying, "I'd rather--yes but no."

Was he surprised to find out she was pregnant?

"No, I--no, I didn't have anything [else to say]," Sudeikis stammered. The reporter added, "Sudeikis seemed comfortable being asked about the situation, just unwilling to say too much."

Last month, Jones' rep would only confirm the pregnancy, telling us, "January Jones is happy to announce that she is expecting her first child this fall" and no word back yet from the rep on baby daddy inquiries.

But with pictures like these of Jones doing the morning after walk of shame, the baby daddy question was anyone's guess.

Since announcing her pregnancy, Jones has been spotted out and about at the Lakers game, grocery shopping and going to the doctor --all solo.

No matter who her Don Draper is, let's just hope Jones is a warmer mother than her Mad Men alter ego Betty!

WATCH: January Jones debuts baby bump