The old war ship was lit up especially for the occasion creating a striking image next to Tower Bridge.
Guests were greeted by a naval piper and treated to drinks and canapés while a live party band played music spanning HMS Belfast's lifetime.
HMS War Veterans were also on board to regale partygoers with stories and give tours of the ship.
The refurbishment project has seen the Admiral's Quarters transformed into a private dining room and event space, as well as The Gun Room and The Ship's Company Dining Room being updated with new carpets, AV equipment and broadband.
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