In a promo clip, which was shared by coaches John Legend and Blake Shelton, the two tried to guess who the new celebrity advisor will be.
"I heard we have a mega mentor?" Legend asked Shelton in the clip, who said he heard the mentor is supposed to be a "big star."
"I heard it's supposed to be one of the most successful people in music," Legend added.
Legend pointed out that the mentor can't be Shelton since he's already a coach on the show.
Swift then casually walked out of a trailer and they all exchanged greetings. However, it took a second for Legend and Shelton to put two and two together. The lightbulb seemed to go off as the pop star's hit "ME!" then played in the background.
Check out the clip, below.
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This will be the second time the Grammy winner has been an advisor on "The Voice" as Swift previously served as a mega mentor back in Season 7.
Swift will assist during the knockout rounds, which begin in October. During the Knockouts, Swift will mentor the singers as they are paired with a teammate and choose their own song to perform individually. The coaches select the winner -- however the artist not chosen can be stolen from another coach.
The new season of "The Voice" will be the first without Adam Levine, who was a coach for the show's 16 seasons. Gwen Stefani will be replacing Levine alongside Kelly Clarkson, Shelton and Legend.
"The Voice" season 17 premieres Monday, Sept. 23 at 8 p.m. on NBC.