GTS Celebrity Constellation is a Millennium class cruise ship of Celebrity Cruises. She is the co-flagship of the Celebrity fleet along with Century-class ship Century. She was originally named Constellation but renamed in May 2007. Her three sister ships are the Celebrity Infinity Summit and Millennium. She was built at the Chantiers de l'Atlantique shipyard in St. Nazaire France.
Builders of the Celebrity Constellation are France and Saint-Nazaire.