Lucas, who directed Fisher as she played Princess Leia in the original Star Wars trilogy, praised Fisher's ability not only as an actor but also as a writer and comedian, and offered his personal condolences to her family.
"Carrie and I have been friends most of our adult lives," Lucas said. "She was extremely smart; a talented actress, writer and comedienne with a very colorful personality that everyone loved.
"In Star Wars she was our great and powerful princess - feisty, wise and full of hope in a role that was more difficult than most people might think," he added.
Fisher died Tuesday at age 60 after suffering a heart attack aboard a flight from London to Los Angeles last week.