Just recently, country star Carried Underwood joined Grammy award winning country singer, Crystal Gayle, onstage at the Grand Old Opry to perform a duet of "Don't It Make My Brown Eyes Blue." (SOUND BITE) When the two were finished with the song, Underwood nvited 65-year-old Gayle to become an official Opry member. (SOUND BITE) Gayle will be formally inducted into the Opry next year, by her sister, country music icon, Loretta Lynn.