The pregnancy of the Republican vice presidential nominee's daughter is only the latest of a number of highly visible teen pregnancies, ranging from celebrities such as Jamie LynnSpears to a group of teens in Gloucester, Mass.
Celebrity offspring from Zoey 101's Jamie LynnSpears (sister of struggling starlet Britney) to Hannah Montana's Miley Cyrus (daughter of country singer Billy Ray) break through the media clutter and get people to pay attention to a movie or television show.