BRB crying. Sara Bareilles and Katharine McPhee teamed up for an emotional and powerful stripped down version of "She Used To Be Mine" from Broadway's smash-hit Waitress.
Bareilles wrote the music for the Waitress, and just finished her third run as "Jenna" on Broadway. Over the summer, McPhee took on the role on Broadway and is now currently starring as "Jenna" at the Adelphi Theatre in London.
If you need me, I'll be watching this video on repeat!