Katharine Elizabeth Gill was born in Santa Monica, California. She is the daughter of actress Morgan Brittany, known for the TV show Dallas in the 1980's and stunt coordinator/2nd unit director Jack Gill. After completing schooling at Agoura High School, Katie moved to Osaka, Japan to work for various print agencies. Upon her return, she started acting at the age of 19 and attended the Joanne Baron/D.W. Brown Studio where she graduated with two years of intensive training. She also traveled to London to attend the Royal Academy of Dramatic Art. She returned to California to work on feature films and various TV shows.