Britney Spears may not be planning to walk down the aisle anytime soon, but she is "excited" for her baby sister, Jamie Lynn, to do so.

The 21-year-old took to Twitter on Sunday to announce her engagement to 30-year-old Jamie Watson. She later posted close-up photo of the ring, sharing her enthusiasm for Watson's ring choice, tweeting, "#hedidgood."

Her big sister, Britney, couldn't contain her joy for her baby sister, taking to Twitter shortly after the news broke. She wrote, "So excited and happy for my sister, congrats @jamielynnspears - love you."

According to an interview Watson gave to the New York Post's Page Six column back in January, marriage has been in the cards for the on-again, off-again couple for some time now. "I think promise rings are dumb," he said of a previous sparkler he had gifted to Spears. "And Jamie Lynn doesn't care that much. She's not too picky."

Spears had previously been engaged to Casey Aldridge, the father of her 4-year-old daughter, Maddie. As a teen, Spears was the star of her own Nickelodeon show, "Zoey 101," but is now hoping to follow in the footsteps of her big sister in the music business. She's working on a country album in Nashville when she's not in Kentwood, Louisiana, with her daughter.

While Jamie Lynn is now planning her wedding, Britney called off her engagement to longtime boyfriend Jason Trawick, back in January, when she also announced she wouldn't be returning to "The X Factor."