Before Levi Johnston and Bristol Palin, Jamie Lynn Spears and Casey Aldridge owned the title of America's favorite unwed celebrity teenage parents.
Like Bristol and Levi, the little sister of Britney Spears was briefly engaged to her baby daddy, only to break things off ... but are they now back on?
The high school sweethearts, who split at the beginning of the year, "are working on things between them," according to a source quoted ...