Posted on Tue May 29th, 2012 1:37pm PDT
Jamie Lynn Spears is all grown up!
Britney's lil' sis, now 21, spent quality time at the pool in Tennessee with her 3-year-old daughter Maddie .. who turns four next month.
Spears, who is hoping to become a country star, recently opened up to Glamour magazine about becoming a young mom at 16.
She tells the mag:
- "I had to make a decision that I could sleep with every night. I did feel responsible for the young girls and the mothers who I probably confused and let down. I apologize for that. But I wasn't trying to glamorize teen pregnancy."
Click thru to see another poolside pic.
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