Brit Imparts Wisdom on Jamie-Lynn

9/1/2006 1:10 PM PDT BY TMZ STAFF
It was girls night out for the Spears sisters Wednesday. Jamie Lynn and a very pregnant Britney took some time away from the Federline boys, Kevin and Sean Preston, for a little ice cream social.
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The two could be seen chatting it up and laughing on their stroll, however, TMZ is still wondering what could have possibly provoked Jamie Lynn to make that interesting face seen in the photo. Your guess is as good as ours.