Too bad she didn’t spill the sex too! Jamie Lynn writes, on her online diary on JamieLynnSpears.com:I like being in LA because I get to spend lots of time with Britney. We are getting ready for the new baby’s arrival in September!!!! I can’t wait. I have been shopping so much for the baby and it is not even here yet.So, there we go. Not August, and not October, as suggested previously. And her mother already denied the twin rumor!