The pop star and her brother, Bryan Spears, were on hand to debut their sister at the Nashville theater.
It was an emotional Spears family reunion at the Grand Ole Opry on Tuesday.
Britney Spears and her big brother, Bryan, made a surprise appearance at the iconic Nashville theater to introduce their sister, Jamie Lynn, whom Britney called her "heart and soul."
Jamie Lynn couldn't stop the waterworks as she took the stage, hugging the 34-year-old pop star, who immediately started to tear up. Watch the "Chillin' With You" singers' adorable moment now.
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"I can't believe that my whole family kept this secret from me!" the 24-year-old country singer tearfully exclaimed as she took the mic. "I'm so honored to be at the Opry, but I'm more honored to be here with all the people that I love the most."
Jamie Lynn took to Instagram to call it the "best surprise ever at the most special place ever."
Britney posted a shot with her brother backstage, captioning it, "Before we surprised @jamielynnspears tonight!! So proud of our baby sister ❤❤❤"
It truly was a full family affair, as the Spears girls' parents, Jamie and Lynne, were also on hand, plus Jamie Lynn's husband, Jamie Watson, and her 7-year-old daughter, Maddie.
Meanwhile, Britney recently opened up about her own new music, calling it the "best thing I've done in a long time." Find out what else she had to say in the video below.