On St Patricks Day in 1938 HMS Belfast was launched and the Royal Navy Ship has been moored on the River Thames since the 1970s.
To celebrate its 75th year, there has been a special ceremony on the cruiser. Glen Goodman was there for today's birthday bash.
The S.A. Agulhas ship left Wood Wharf in Isle of dogs at 2pm and it will arrive near HMS Belfast around 2.30pm today.
The SA Agulhas ship will be coming from Canary Wharf and through Tower Bridge before mooring alongside HMS Belfast at London Bridge.
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The Coldest Journey's ice-strengthened expedition ship, the SA Agulhas, is arriving this afternoon at approximately 3pm to moor alongside the HMS Belfast at London Bridge. She is big, red and has Seeing is Believing written along each side.
The Coldest Journey expedition, led by explorer Sir Ranulph Fiennes, aims to complete the first ever transantarctic crossing during the polar winter, whilst raising money for Seeing is Believing, a charity tackling blindness.
The ship will be moored at London Bridge until 6 December, when she departs destined for South Africa where she will be met by Sir Ranulph Fiennes.
Veterans have attended a special lunch on the 68th anniversary of the D-Day landings.
Read the full storyVeterans from the D-Day landings are being hosted at a lunch on board HMS Belfast today.
The ship has only recently been re-opened to the public after the gangway collapsed into the River Thames in November 2011.
D Day Veterans from Hillingdon are piped aboard HMS Belfast on the 68th anniversary of the Normandy Landings.
They are attending a special lunch on board the ship.
Veterans of the Normandy landings will today be treated to a special lunch on board HMS Belfast.
The event is being staged by Hillingdon Council, with big Lottery Funding, to mark the anniversary of D Day and the Queen's Diamond Jubilee.
Glen Goodman went aboard the WW2 cruiser on the Thames which reopened to the public today.
HMS Belfast has reopened to the public six months after the walkway which connected it to the shore collapsed. An investigation found that workmen had cut through part of it by accident.
The cruiser's director Phil Reed explained to Glen Goodman how the walkway had been replaced.
