Gwen Stefani and Blake Shelton dressed up on Wednesday in Nashville for the milestone event "Opry100: A Live Celebration," ...

Gwen Stefani put a sheer spin on the little black dress for her look at the "Opry 100: A Live Celebration" event on Wednesday ...

Gwen Stefani/Instagram Gwen Stefani ... it to represent the city where the band formed in 1986. Stefani paired the outfit with plaid boots, a long-sleeved button-down shirt wrapped around her ...

"Well, not anymore, thanks to this new album, Gwen's Gone Country," the host teases, holding up an album featuring Stefani standing in a field and wearing a cowboy hat and denim ensemble.