Watch! Amber Riley's Mercedes Sings Gloria Estefan's "Don't Wanna Lose You" in Glee Season 3, Episode 12: "The Spanish Teacher" (VIDEO) Tweet February 8, 2012 by Beth Douglass Related: Glee, Music , Amber Riley , Mercedes Jones , Season 3 Episode 12 Original airdate: Tuesday, February 7, 2012 at 8/7c on Fox
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