Taylor Swift made a surprise cameo on Monday's (June 3) episode of 'The Voice,' surprising Team Usher's sole remaining contestant Michelle Chamuel during the rehearsal session for the live show.

Chamuel, a quirky, bespectacled singer with a bit of indie sensibility, was belting out Swift's 'I Knew You Were Trouble' in the practice room when Usher, well, ushered Swift into the space.

Swift was mouthing the words as Chamuel, whose back was to her, sang into the mic. Upon spotting her, the reality hopeful had a bit of strange reaction to one of the biggest superstars in the world sneaking up on her. She kept singing, but slowly faded out, soon asking, "Do I really have to keep singing right now?" She was awestruck by Swift's presence.

In her typical warm and fuzzy fashion, the 'Begin Again' hitmaker gave Chamuel a hug and thanked the up-and-comer for choosing to sing her song. She also said she'd love to hear Chamuel's full version of her pop hit.

It's undoubtedly super nerve-wracking to have the person who wrote a smash hit critique your amateur rendition of it, but Swift was incredibly kind to Chamuel. She immediately engulfed the contestant in another hug after she rehearsed the song, saying, "Oh my God, that was so emotional, the vocal runs."

With an approval from Taylor Swift, Chamuel was full of confidence, delivering a live performance that showed off her mainstream side. She doesn't need much more after getting a thumbs up from Swift, right?

Well, actually America's votes will help, since it's a singing competition. But having Swift firmly in her corner had to be the experience of a lifetime.