The Italian fashion designer revealed he thinks Britain's future princess - who will marry Prince William on April 29 - is "highly aware of fashion trends" and he is looking forward to seeing her outfit choices in the future.
Giorgio - who will design Charlene Wittstock's wedding dress when she marries Monaco's Prince Albert in July - told WWD Kate is "so discreet and straightforward, but highly aware of fashion trends".
He added: "She will have all the time in the world to become fully integrated into her new role and choose the most sophisticated and precious dresses and outfits for official occasions."
Armani is not the only famous designer to admire 29-year-old Kate; Karl Lagerfeld has previously praised her "chic" look and commented that she is both "beautiful and elegant".
He said: "FOR the royals, apparently the royal blood is not in demand any longer.
"Better for the generation to come. She is very different from Princess Diana, and seems a very well-balanced and a happy person. She is chic in a way the position needs."