The former couple's relationship has since been tenuous, at best, with 19-year-old Johnston being labeled as a deadbeat dad by Sarah Palin's father.
Johnston has said the Palins have limited his access to Tripp since the breakup, which he said was mutual. In the weeks following the split, Johnston said he needed to mature before becoming a husband but held out hope that he and Palin would reconcile.
Bristol Palin said she wants to maintain some kind of relationship with Johnston for the benefit of her son. "I'd love Levi to be a part of his life and I know he will be," she said. "Every child needs a father."
Palin said she didn't pay much attention to the intense media coverage that started when her mother was thrust into the national spotlight during the presidential campaign, including Tina Fey's Sarah Palin impersonation. "It's unreal," she said.
Palin is but one visible example of a nationwide trend. For the second year in a row, the country's teen birth rate has increased.
Three out of 10 girls in the United States will get pregnant and less than half of those women will earn their high school diploma, according to the National Campaign to Prevent Teen and Unplanned Pregnancy.