America's Favorite Unwed Pregnant Teen Turns 17

Posted Apr 4th 2008 1:33PM by TMZ Staff

Britney's pregnant baby sister, Jamie Lynn, celebrated the eve of her 17th birthday by hitting up a Louisiana JC Penney on Thursday -- with her soon-to-be baby daddy Casey Aldridge. Awww. What great role models.

The expectant parents are allegedly engaged. They're the teen Brangelina!

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