Bristol Palin, the teenage-pregnancy poster girl, sought full custody of her and ex-boyfriend Levi Johnston's son Tripp after they called off their engagement in 2009. The matter went back and forth in a fashion that could make many wish Palin had heeded her own abstinence-only advice. A final agreement reached in 2010 awarded Palin primary custody of Tripp and allowed Johnston twice-a-week visits. The couple share legal custody and Johnston pays child support.