The fourth season of MTV's Sixteen and Pregnant premieres tonight, but if, for some reason, you really want to get ahead on this one, you're in luck. This morning's GMA featured an interview with two of the show's new cast members, Brianna DeJesus and Katie Yeager. The segment was brief, but that doesn't mean that you don't get a depressing taste of the difficulty and sadness that has made the series one of the most successful on the network (humans, we're the best). Brianna's baby's father is M.I.A., over 50% of teen moms don't live with the father of their baby within a year of childbirth and both girls are struggling to keep up with school work (and, on a positive note, both are actually managing to do so). Tune in tonight (or don't) for the rest.