GTS Millennium is the flagship of the Millennium Class of cruise ships operated by the Celebrity Cruises line. Her sister ships are Constellation Infinity and Summit. She was built at Chantiers de l'Atlantique in St. Nazaire France. When launched in 2000 Millennium was the world's first ship to use a turbo-electric COGES power plant.
Builders of the Celebrity Millennium are Chantiers de l'Atlantique, France and Saint-Nazaire.