It looks like Britney Spears‘ pregnant little sis, Jamie Lynn, 17, won’t be getting married to Casey Aldridge, the 19-year-old father of her child, after all. According to Star magazine, the teens are having a hard time getting along. “Jamie Lynn and Casey have been fighting non-stop about everything, from what to name the baby to what to eat for dinner,” a source told the magazine. “And now she’s called off their wedding plans.” The source also said that Jamie Lynn, who bought a house in the Spears’ hometown of Kentwood, Louisiana, has moved back into the Spears’ family home. Her baby is expected to be born later this month or early July.