Looks like sixteen will be more than just sweet for Jamie Lynn Spears.

The expectant actress is getting hitched to her soon-to-be baby daddy, Casey Aldridge, 18.

According to People:

"She's got an engagement ring," the source says. "She's been showing it off, talking about it."

Since the two are teens, it's pretty safe to assume that they got engaged because of the impending babe.

Do you think it makes sense for them to get married?