Silversea Cruises has ordered a 596-passenger ship from Fincantieri that the luxury line is calling its new flagship vessel.

To be called Silver Muse, the 40,000-gross-ton ship is expected to be delivered in the spring of 2017. It will be Silversea's largest ship and the ninth in its fleet.

"This ship contributes to our ambitious growth plans that will ensure our continued leadership in ultra-luxury cruising,” Silversea CEO Enzo Visone said in a statement.

Silversea’s most recent new ship is the 540-passenger Silver Spirit, delivered in December 2009. It has acquired several small expedition-style ships since then. Silversea said additional specifications and details of the new ship would be announced in the near future.

Seabourn, Regent Seven Seas Cruises and Crystal Cruises are among the luxury lines with new ships in the works.