When Teen Mom spun off from MTV's 16 and Pregnant on Dec. 8, 2009, viewers fell in love with the series. Original stars Farrah Abraham, Maci Bookout, Catelynn Lowell, and Amber Portwood went through a roller coaster ride, and they didn't do it alone. Their partners and family members went through a lot of drama too. But that's why the show was so addictive. And it was such a hit that it created two spin-offs, Teen Mom 2, and the short-lived Teen Mom 3. Then producers decided to go back and revive the original Teen Mom series titled Teen Mom OG on March 23, 2015. So let's look back over the years and see the Teen Mom cast then and now.