1. Jenelle Evans (Teen Mom 2, MTV, 2011-Present)
Children are undoubtedly molded by their surroundings, so it's extremely important to make sure that they're nice and stable from the beginning. Unfortunately, Teen Mom 2 wouldn't be an MTV series without a few totally unstable people, one of which is, without doubt, Jenelle Evans.
Evans is only 20, but she's already had a child, been arrested for fighting in public on one occasion and for possession of drug paraphernalia on another, failed a court-mandated drug test during her probation, and can't seem to stop going back to her deadbeat ex who, believe it or not, is worse than she is. Her portfolio of inefficiencies is stacked.