Britney Spears has sent her congratulations to her newly-engaged sister on Twitter.

Brit's 21-year-old sister, Jamie Lynn Spears, announced her engagement to fiance Jamie Watson on Instagram over the weekend.

Late Monday, Britney tweeted, “So excited and happy for my sister," adding, "Congrats @jamielynnspears - love you."

Jamie Lynn's announcement came less than two months after Britney revealed that her own engagement to Jason Trawick had ended.

Copyright 2013 ABC News Radio