Stefani will serve as a mentor for Shelton's team on "The Voice" Season 10, which premieres Feb. 29.
The pair announced the news on "Access Hollywood" in their first joint interview earlier this month.
"We know we collaborate well together as coaches, so of course I would have her as my mentor," Shelton said at the time. "And she's so smart and talented."
Stefani will release her third solo album, "This is What the Truth Feels Like," on March 18. Shelton last released "Bringing Back the Sunshine" in September and will release his 10th studio album this year.
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