Britney Spears; Jamie Lynn Spears Credit: Jamie McCarthy/Getty; Chris Polk/FilmMagic

Britney Spears is ready to walk down the aisle again after all -- as a bridesmaid, that is. Over the weekend, the pop superstar's baby sister Jamie Lynn Spears took to Twitter and Instagram to announce her engagement to Jamie Watson, her boyfriend of three years.

"So excited and happy for my sister," Britney, 31, tweeted past midnight on Monday (March 3). "Congrats @jamielynnspears - love you." Jamie Lynn shared her dazzling engagement ring with her Instagram followers and praised her hubby-to-be's selection: "He did good."

The wedding news may be somewhat bittersweet for first-time bride Jamie Lynn's famous older sister. Britney and love Jason Trawick broke off their engagement back in January; the "Criminal" singer has been wed twice before -- to pal Jason Alexander (for 55 hours!) and Kevin Federline, with whom she has two kids.

"The romance is gone," one insider told Us Weekly of Spears and Trawick late last year. Trawick "puts her on speakerphone so friends can hear her nagging," the source added at the time.