Jamie Lynn Spears and Casey Aldridge are set to marry.

Britney's 16-year-old sister is reportedly "desperate" to marry her boyfriend, despite her parents' hesitations. A source close to the Spears family said: "Jamie Lynn and Casey want to get married really bad. But both sets of parents don't think they should. They think they are too young and should wait," FemaleFirst is reporting. We still can't seem to get Aldridge's actual age, though. He has been variously reported as being 17, 18 and 19 years old.

Meanwhile, Britney seems to have gotten over her initial shock and disappointment at being the last to hear the baby news. She reportedly spent $500 on a gift basket for Jamie Lynn yesterday at the Beverly Hills baby boutique of the stars, Petit Tresor. Among her purchases? A vest with "Hot Mama 2 B" printed on it.

And Nickelodeon, which airs the children's TV show 'Zoey 101' in which Jamie Lynn stars, is said to be planning a special episode about sex and love. Too bad they didn't think to do that before their star got knocked up.