By Brandy McDonnellMusical power couple Blake Shelton and Gwen Stefani gave a sweet acoustic fireside rendition of their hit duet "Nobody But You" from his ranch in Tishomingo on Sunday's "ACM Presents: Our Country" special, which aired on CBS. As previously reported, the two-hour special Sunday night filled the time slot reserved for this year's Academy of Country Music Awards, as the awards show was postponed due to the coronavirus pandemic.