GTS Celebrity Constellation (formerly Constellation) is the fourth and final Millennium-class cruise ship built for Celebrity Cruises, a subsidiary of Royal Caribbean Group. She was renamed in May 2007 to add the "Celebrity" prefix,[2] joining her three sister ships: Celebrity Infinity, Celebrity Summit, and Celebrity Millennium.
She was built at the Chantiers de l'Atlantique shipyard in St. Nazaire, France. The ship is powered by a COGES[3] power plant of gas turbines and a steam turbine providing up to 60 megawatts for the electric systems and two 19 MW Rolls-Royce/Alstom MerMaid azimuth thrusters for propulsion. In 2007, an additional diesel engine was fitted as a fuel-saving measure.[4]