lrimesexcl121411_01-fullcropWM.jpgLeAnn Rimes  Eddie Cibrian boots jeans blazer

... and with an adorable face like Jake's, how could they not be?!

LeAnn Rimes and Eddie Cibrian spent the afternoon with their four-year-old son ... bringing holiday cheer to his classmates. Sounds like the Christmas spirit is alive and well!

The country songstress performed at a teacher luncheon singing "Silent Night" for the small group ... and one teacher Tweeted that LeAnn "gave everyone chills & not a dry eye." With that incredible voice, we believe it!