Random New Chick Joins Cast of Teen Mom OG! For Real! Co-Stars React! [UPDATED]

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Well, she may not be an OG, but she's definitely one of most famous former teen moms of all time.

We learned moments ago that Bristol Palin is joining the cast of Teen Mom OG in time for the long-running series' upcoming season.

Needless to say, fans of the show are buzzing with anticipation ... or scratching their heads wondering WTF is going on.

Teen Mom OG remains a ratings powerhouse, for sure, but almost a decade into its run, producers clearly wanted to shake things up.

Show-runners have made no secret about the fact that they've been on the lookout for a way (or ways) to keep things fresh.

Casting the daughter of the most bonkers vice presidential candidate in US history should certainly help them to achieve that goal.

Here's what we know about the situation so far, including some surprising details of how it came together, and how the cast is reacting:

1. The Pistol!

The Pistol!
TMZ reported, and The Ashley's Reality Roundup confirms, that Bristol has signed on to be the fifth cast member on Teen Mom OG. She will join Catelynn Lowell, Maci Bookout, and Amber Portwood, as well as The Challenge star Cheyenne Floyd.

2. Palin Makes Five

Palin Makes Five
“They wanted five girls, like they have for Teen Mom 2 because it’s been working out well in terms of story lines,” a production source told the Ashley.

3. Who Knew?!

Who Knew?!
Not them. “Amber, Catelynn and Maci did not even know,” a production source says. “It was kept under wraps because MTV was afraid that Sarah [Palin] would pull out, and MTV knew that the original girls would be upset. In fact, they even used a different name when discussing Bristol being on the show, to keep it a secret!"

4. Maci Wanted Out?!

Maci Wanted Out?!
According to The Ashley, Bristol was cast because Maci was refusing to film. “She basically told production and crew that she wasn’t going to film if [her son Bentley’s father] Ryan Edwards was filming because she didn’t want his drug struggles to play out on TV anymore. She didn’t want Bentley to be able to watch that go down.”

5. What About Ryan?

What About Ryan?
Edwards' filming status is still unclear, but Bookout is definitely in. So is Palin, though. After she agreed to come on board, producers decided to proceed even with Maci back in the fold. “It worked out because MTV is happy to have five girls on the show now,” the source added.

6. Odd Woman Out

Odd Woman Out
Once again, Mackenzie McKee is wondering what might have been. She has been rumored to be joining the ‘OG’ cast multiple times in recent years, including today by TMZ. But The Ashley can confirm that’s incorrect. Cheyenne Floyd is still being added to the cast, as well as Bristol, but Mackenzie is not.

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