Katie Lohmann was born in Scottsdale, Arizona on January 29,1980. She is the youngest of three children, having a sister named Christine and a brother named Michael. Her father Dan is a successful accountant, and has owned numerous lucrative businesses. Her mother Sharon is the head of Payroll for Citibank. Her parents divorced in 1992.
Katie discovered early on that she loved to be on stage performing, her first performance was singing a song from the Walt Disney classic The Little Mermaid, at the age of eight, where she received a standing ovation. Then in 1989 a casting took place for The All New Mickey Mouse Club. Although Katie had never worked on a television show, she felt that this would be the perfect opportunity and was told she was exactly what they were looking for. Unfortunately her mother felt she was too young and the show would interfere with her education. She decided to take her mother's advice and wait until she was finished with school before pursuing her career.