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LeAnn Rimes was one of the featured performers at the ASCAP cafe in Sundance yesterday, where she debuted a new tune about cheating on her now ex-husband, Dean Sheremet.

Some of the lyrics include:

    "What have I done? I broke the heart of the sweetest man. What have I done? I broke the heart of the only man who's ever loved me. Who have I become? I hope you find someone new, someone who deserves you."


A source tells Us that the song was written "during the height of the cheating" and "100%" about LeAnn's ex (although another source denies that.)

So now that she's apologized to Dean in song, can Brandi Glanville expect her own LeAnn Rimes-penned tune soon?