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Before Stefani's surprise performance, Shelton warmed up the audience with some of his greatest hits, including "Neon Light" and "All About Tonight." Then, Stefani hit the stage—and as videos on Twitter confirm, one of the songs she performed was the No Doubt hit "Don't Speak."
Shelton recently opened up to People about Stefani and how he wishes everyone could have the privilege of knowing her.
"I wish everybody could have a chance to meet and talk to Gwen Stefani at some point in their life because you'll just be a better person for it, is the only way I know to say it," Shelton said. "She's just a magical person to be around."
The Voice Season 22 premieres Monday, September 19 at 8/7c on NBC. It's the first season Stefani and Shelton are coaching on together since tying the knot in summer 2021. The "Hollaback Girl" singer has appeared as a Coach on previous seasons, but she tells NBC Insider returning this time is "surreal."
"Stepping back on the set of The Voice this time was very surreal," she said. "Being married, it brought back so many memories of all the different seasons that we've been on The Voice together, all the different phases of our friendship, of our relationship."
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