The former Sabrina The Teenage Witch star is one of 16 celebrities who will compete to win the Glitter Ball trophy when the ABC reality show returns for its ninth season next month.
Speaking to Access Hollywood, she said: "If you had asked me my entire life, 'What do you want to be when you grow up?' I was, 'I want to be dancer'.
"This is my opportunity to get out there and actually perform... [To] dance with a pro and have to compete against pros in the actual costumes, in front of a live audience... This is everything I've always dreamed of in a condensed amount of time."
The actress, who has been partnered with last year's winner Mark Ballas, added: "I'm just bracing myself for the kind of, you know, rigorous routine. For a few weeks, a few months I get to be a professional ballroom dancer and that's going to be amazing and such hard work and I'm ready for it."
The new season of Dancing With The Stars premieres on September 21.