The star took to Instagram on Thursday, December 13, to share a photo of herself smiling in delight after discovering she would get to sing the original tune for an undisclosed job.
"This is what your face looks like when you find out that @sarabareilles has written a song especially for u (sic) on a super secret project...," she captioned the snap.
Kristen hasn't shared any further clues about the gig in question, but she has been working on the long-awaited sequel to hit Disney movie "Frozen (2013)", which is currently in production. She voices the character of Princess Anna.
"Frozen 2" is set to hit cinemas in November, 2019.