Another Baby Spears is Born To An Unsuspecting World

(TMZ) Jamie Lynn Spears is no longer an unwed pregnant teen -- she's now an unwed teen mother of a baby girl, y'all!

We're told Jamie Lynn was extremely nervous before the birth, but our spies tell us big sister Brit "made a big difference" and helped a ton -- giving her advice and support.

JL's bro Brian was on family patrol, calling everyone with the news. As for a name -- the kids didn't narrow it down til the very last second. People says lil' Spears' will be called is Maddie Briann. - more on this story

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