Gwen Stefani and Blake Shelton’s wedding may be way into the future, but they do have one thing sorted! Today, singer Miley Cyrus offered the couple her services as a wedding singer via a series of tweets. The exchange between Gwen and Miley began when the Hollaback Girl singer saw the 28-year-old artist perform "Prisoner" on NPR's Tiny Desk Concerts series and commented "Talented geeezzzz," Stefani wrote.