Kelsey Stewart was born in Chicago and raised in Seattle. She began her performance career as a ballet dancer, training and performing with esteemed institutions including the Royal Ballet, Pacific Northwest Ballet, Atlanta Ballet, and the International Ballet Academy. She later pursued music at Loyola Marymount University in Los Angeles, where she earned her bachelor's degree and expanded her artistic repertoire to include acting, with film credits in It’s Dark Here and A Beautiful Now. She also has commercial credits for Mountain Dew and has modeled for Abercrombie & Fitch and St. Tropez. She plays piano and guitar.

As a vocalist, Kelsey performed the role of Ruth in The Pirates of Penzance in three productions, toured Europe—singing in historic venues such as the Vatican and the Sistine Chapel—and has graced the stage of the John F. Kennedy Center for the Performing Arts and Wortham Theater with the Houston Grand Opera.

In 2023, she was honored as one of Paper City Magazine’s "Thirty-Five Bold and Beautiful Women." Kelsey is currently pursuing her master’s degree in creative writing and literature at Harvard University.