A Spears is getting married! And, no, it's not Britney.

The singer's 21-year-old sister, Jamie Lynn Spears, announced her engagement to Jamie Watson, her 30-year-old boyfriend of three years, on Instagram.

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"Guesssss what?????? she wrote. "#Hedidgood".

This is Jamie's second engagement. She was once set to wed Casey Aldridge, the father of her now 4-year-old daughter, Maddie.

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