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Cast Shakeup! Mackenzie McKee Joining ‘Teen Mom OG’ To Replace Bristol Palin Maci, Amber, Catelynn & Cheyenne revealed they don’t want a new co-star.

Maci Bookout, Amber Portwood, Catelynn Lowell and Cheyenne Floyd won’t be the only cast members of Teen Mom OG this upcoming season!

Multiple sources exclusively confirm to RadarOnline.com that Teen Mom 3 star Mackenzie McKee will join the series after Bristol Palin quit the show.

The new addition comes after Mackenzie lost a spot on Teen Mom 2 to Briana DeJesus and on Teen Mom OG to Bristol.

Scroll down RadarOnline.com’s gallery to go inside the cast shakeup!