The "Used to Love You" singer will be back on NBC's hit singing competition show as the advisor for the country singer's team.
"We know we collaborate well together as coaches, so of course I would have her as my mentor, and she's so smart and talented!" Shelton, 39, tells PEOPLE exclusively.
Stefani's new role is a change for the stars, who have competed against each other twice as coaches on the show.
Earlier on Wednesday, the rock queen, 46, announced her third studio album This Is What the Truth Feels Like will be out March 18, and her music video for her new single "Make Me Like You" will be created live during a four-minute commercial break during the 58th Annual Grammy Awards on Feb. 15.
Season 10 of The Voice premieres Feb. 29 at 8 p.m. on NBC.