However, upon the formation of Celebrity Cruises after an agreement with the government of Bermuda,[3][4] it was transferred while under construction, and entered service for the new upscale brand.

The ship underwent refits over the end of 2005 and the beginning of 2006 and was operating out of Palma de Mallorca in the Mediterranean Sea as Island Star in summer and from Caribbean in winter season of 2008.

[10][11] In late 2016, it was announced that the CDF Croisières de France brand was to be discontinued, with Horizon returning to the fleet of Pullmantur Cruises.

[12] In June 2020, as a result of the ongoing COVID-19 pandemic, Pullmantur Cruises filed for financial reorganization under Spain's insolvency laws.

[13] The following month, Royal Caribbean International's CEO Richard Fain stated that Horizon, along with the other ships in Pullmantur's fleet, had been or will be sold.