Jamie Lynn Spears, 21, has announced her engagement to her businessman boyfriend, Jamie Watson, on Twitter, just weeks after her big sister Britney Spears, 31, and her manager fiance, Jason Trawick, called off their own engagement after four years together.

Jamie Lynn Spears and Jamie Watson, Twitter

"Guess what??????" the younger Spears tweeted, along with a picture of her donning a sparkling engagement ring. She later offered her Twitter followers a close-up image of the ring, along with the hashtag #hedidgood."

Jamie Lynn Spears, Twitter

Spears was previously engaged to the father of her daughter Maddie, 4, Casey Aldridge. And now that her second engagement has been announced, Spears' number one supporter is her superstar sister. "So excited and happy for my sister, congrats @jamielynnspears – love you," Britney wrote.

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