Gwen Stefani isn't the only veteran of "The Voice" returning to the show this season.

Season 17 of the NBC singing competition will welcome back Taylor Swift to the role of "Mega Mentor." The 29-year-old pop star is returning after mentoring contestants during season 7.

On the show, Swift will work with the four teams of singers – who will team up with coaches Gwen Stefani, Blake Shelton, John Legend and Kelly Clarkson – during the show's knockout rounds to refine their performances.

Stefani is also returning to "The Voice" after serving as a coach on Seasons 7, 9 and 12. Adam Levine announced in May he would leave the show after 16 seasons.

"The Voice" announced Monday that Swift would join the show in a video on Instagram that featured Legend and Shelton brainstorming on the season's new mentor as Swift emerged from a trailer behind them.

Swift joins a number of previously announced, team-specific mentors for season 17: Normani for Clarkson's team, Will.i.am for Stefani's team, Usher for Legend's team and Darius Rucker for Blake's team.

"The Voice" Season 17 premieres Monday, Sept. 23 at 8 p.m. on NBC. Check local listings.

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