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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: