While he's renowned for the decade-old hit "Blue Ain't Your Color," 2012-inducted Grand Ole Opry member Keith Urban sang 2017 cast ... the NBC-broadcasted "Opry 100" for another reason.

The star-studded lineup for NBC's upcoming Opry 100: A Live Celebration just keeps expanding, with the network announcing ...

Keith Urban's friendship with Crystal Gayle's sister, Loretta Lynn, made his Opry 100 performance of "Don’t It Make My Brown Eyes Blue" a special one.