Jump to Series overview - Website. Teen Mom (renamed Teen Mom OG since the fifth season) is an American reality television series that premiered on December 8, on of seasons: 7. Jul 19, - Bristol Palin Joins MTV's 'Teen Mom OG' As Series Regular. Bristol Palin has signed on to MTV's Teen Mom OG as a new series regular for the upcoming season, Deadline has learned. Palin will join cast members Amber Portwood, Maci Bookout and Catelynn Lowell when the series returns this fall.