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.