Britney Spears' sister Jamie Lynn engaged

Britney Spears' younger sister Jamie Lynn Spears is engaged.

The former Zoey 101 star took to her Twitter.com page on Saturday to announce she is set to wed long-term boyfriend Jamie Watson by sharing a snap of the pair hugging while showing off her engagement ring.

She later posted a close-up snap of the ring alongside the caption "He did good".

Spears, 21, was previously engaged to Casey Aldridge, the father of her four-year-old daughter Maddie, but the pair split in 2010.