Miranda Lambert -- Overtaken By Emotion Onstage Days Before Divorce Decree (VIDEO)

Miranda Lambert broke down on stage Saturday as she sang a song which was given to her by Blake Shelton.

Miranda was at Cheyenne Frontier Days in Wyoming when she tried singing "The House that Built Me." It was originally written for Blake but he gave it to Miranda to record and it became a big hit for her.

She started choking up and ended up asking the audience to help finish.

TMZ broke the story ... just 2 days later, her divorce to Blake became final. He's the one who filed divorce docs.