Brightman will preside over a glittering evening celebration attended by passengers and crew before the ship sails on a 10-day maiden voyage bound for Indonesia.
Seabourn president Rick Meadows said Brightman 'embodies the style and sophistication, the talent and innovation, the playfulness and inviting warmth' that reflect Seabourn.
Brightman launched her career with the British dance troupe Hot Gossip in the late 1970s. In 1981, she made her West End musical theater debut in 'Cats,' and went on to star in several West End and Broadway musicals, including originating the role of Christine Daaé in 'The Phantom of the Opera. '
Brightman furthered her musical career as a classical crossover artist, a genre she is often credited with creating and has sold more than 30m albums worldwide. Her 1996 duet with Italian tenor Andrea Bocelli on 'Time to Say Goodbye' became an international sensation and one of the best-selling singles of all time.
Brightman is the first artist to have been invited twice to perform the theme song at the Olympic Games. The first was at the 1992 Barcelona Olympics, where she sang 'Amigos Para Siempre' with Spanish tenor José Carreras. She also appeared at the 2008 Beijing Olympics, performing 'You and Me' with Chinese singer Liu Huan. In 2012, Brightman accepted the UNESCO nomination for Artist for Peace, honoring her 'commitment to humanitarian and charitable causes.'