The 31-year-old singer is thrilled at the news her younger sister, Jamie Lynne Spears, is to marry her boyfriend of three years, Jamie Watson, and the newly-brunette beauty shared her congratulations on Twitter. Britney posted: \'So excited and happy for my sister, congrats @jamielynnspears - love you. (sic)\' Jamie, 21, revealed her happy news on Sunday (03.03.13) by posting an Instagram photo of her dazzling diamond engagement. Referring to her fiance\'s gesture, she wrote: \'He did good! (sic)\' This is the actress-and-singer\'s second engagement after she was previously set to walk the aisle with her on/off boyfriend of five years Casey Aldridge, the father of her four-year-old daughter Maddie, before they split up in February 2010. Jamie\'s happy news comes shortly after her sister Britney - who has sons Sean Preston, seven, and Jayden James, six, from her marriage to Kevin Federline - split from her fiance of 13 months Jason Trawick in January and she recently admitted she will \'always love\' the talent agent. She said: \'Jason and I have decided to call off our engagement. I\'ll always adore him and we will remain great friends.\' From:msn arabia