The other ship docked perpendicular off the stern of the Princess ship is the OceanBreeze, formerly Southern Cross.
Imperial Majesty cruise line would have had to spend too much money to get the OceanBreeze up to current SOLAS standards so they took her out of service, my guess is that she has been scrapped by now.
Talk about a groundbreaking ship with a history. Built in 1954, comissioned by (a very young) Queen Elizabeth II, built by Harland & Wolff, Ltd. in Belfast, Ireland, same place that launched the ill fated Titanic. She originally ran a route from Southhampton to South Africa and to take advantage of the favorable weather conditions, they moved machinery to the aft most part of the ship and positioned the funnel as far back as possible to add a huge sun deck in the middle of the ship. The pilothouse was positioned almost amidships which made room for another sun deck directly in front of the wheelhouse. This was genius from a crew's perspective as the watchstanders could now stare at the bathing beauties while driving the ship. Maybe not such a good idea from a safety standpoint. This was also the world's first Cruise Only ship as she made no provisions to carry cargo on board.