<p>Remember the Celebrity Zenith? The much-beloved, 1,378-passenger vessel, well known among American cruisers before it was transferred to Spanish line Pullmantur in 2006, was involved in a collision this morning in the Greek port of Piraeus. </p><p>The Associated Press reports that the 16-year-old ship ran into another Europe-based cruise ship, the Greek-flagged Aegean Pearl, while in the harbor. </p><p>Nobody was injured in the accident, but Greek authorities are not allowing the ships to sail until they can assess the damage to the vessels.</p><p>The 16,700-ton Aegean Pearl, operated by Louis Cruise Lines, had been due to leave Piraeus this morning for a cruise to Turkey and the Greek islands. The 47,000-ton Zenith had just arrived in Piraeus on a cruise that started from Venice, Italy.</p><p>&nbsp;</p>