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If you watch Teen Mom 2 online, then you’re likely aware that the show’s fan base is caught up in an ongoing mystery.

A mystery that has inspired more discussion, social media sleuthing and wild theories than the series finale of LOST.

We’re talking, of course, about the speculation surrounding the identity of pregnant cast member Kailyn Lowry’s baby daddy.

Throughout her third pregnancy, the usually candid star has been uncharacteristically cagey on the question of who knocked her up.

But as eagle-eyed fans – and celebrity gossip sites – have noted, the 24-year-old MTV star has occasionally let her guard down.

Fans are convinced that Chris Lopez got Kailyn pregnant, and while there are many clues to support this theory, one stands out:

The manner in which Lowry refers to the bun in her oven.

Kailyn is in the habit of calling her unborn child "Baby Lo," which many believe is an inside joke referring to the similar letters in Lowry and Lopez’s last names.

Interestingly, Kailyn has yet to refute those rumors, and it seems she’s still fond of that possibly very meaningful nickname:

Lowry posted the above selfie earlier today, showcasing her increasingly large baby bump along with the following caption:

“Happy bump day from Baby Lo & me."

Yes, Kailyn is still calling her forthcoming bundle of joy Baby Lo (she has also referred to "Chris" at least once, FWIW_.

But with that said, there a could be another explanation for it that moniker that most of her fans have failed to consider.

That, or Kailyn’s team is desperately running interference so that she doesn’t get sued by a guy who clearly doesn’t want his name out there:

“It stands for littlest one,” a source close to Kailyn recently told Radar.

We’re gonna go ahead and call BS on that for a number of reasons:

For starters, referring to your youngest kid as "littlest one" sounds like something out of a dusty Victorian novel, not an MTV reality show.

Kail also isn’t one who speaks in antiquated, scholarly riddles. That’s not a knock on Lowry, we’ve just never heard her make such a reference.

On top of that, if that’s the explanation for the nickname, why wouldn’t Kailyn just come out and say so when these rumors first circulated?

She’s clearly fed up with the speculation about her unborn child (which she has invited on many occasions, but that’s neither here nor there).

The "littlest one" clarification would at least put one theory to rest.

We’re thinking that Lowry doesn’t want to confirm that fans nailed it, because she likes the attention and is keeping that card close to the vest.

At the same time, she doesn’t particularly mind if Teen Mom 2 obsessives continue linking her to Lopez, or else she’d say it’s not him.

In the meantime, we’ll continue to scour the web, parse every word she utters and further investigate in search of additional answers.

#THG4TRUTH