Katherine Grant was born on March 23, 1970 in Elizabeth, New Jersey. She attended the Juilliard School and the University of Pennsylvania. Shortly after graduating from Juilliard, she appeared in the 1996 US tour of the musical Applause, as "Eve", with Stefanie Powers. She appeared Off-Broadway in Wonderland in 1999, Hard Feelings in 2000, Summer of '42 in 2001, Radiant Baby in 2003, The Beard of Avon in 2003, Between Us in 2004, and The Marriage of Bette and Boo by Christopher Durang in 2008.