Stefani and Shelton became an item while shooting the last season of the programme, on which both were judges.

Gwen's spinning hot seat will be taken by the show's original judge Christina Aguilera for the new season, but the Don't Speak singer will be coming back to help the members of her beau's team perfect their scales and performance talents.

"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

Meanwhile, Patti LaBelle will join Aguilera as a mentor, and Sean 'Diddy' Combs and Tori Kelly will also offer up words of wisdom to the wannabes.

Miley Cyrus has signed on to serve as a key adviser for the upcoming 10th season of The Voice, which returns to U.S. TV on 29 February (16).