Queen Elizabeth II becomes the longest serving Queen surpassing the record set by her great-great-grandmother Queen Victoria

Around 5.30pm today, the Queen will make history by becoming the longest serving monarch in English history. The Queen, 89, will have reigned for 63 years and seven months. By Buckingham Palace’ calculation, she will have reigned for 23,226 days, 16 hours and about 30 minutes.

An official photograph, released today which was taken by McCartney, the daughter of former Beatle Sir Paul McCartney

The Queen’s portrait was released to mark the milestone.

The photo was taken by celebrity photographer,Mary McCartney, daughter of former Beatle Paul McCartney.

McCartney said: ‘Having grown up during the reign of Queen Elizabeth II it was a thrill to meet her and a very great privilege to take her photo on this historic occasion.

‘She is a truly inspirational person, a trailblazer and a beacon for womankind.’

Prime Minister David Cameron in his tribute to the Queen, told Cabinet colleagues at their weekly meeting in Downing Street on Monday that the Queen was ‘a symbol of Britain’s enduring spirit admired around the world’, with a ‘remarkable record.’

On the River Thames, historic vessels, leisure cruisers and passenger boats will take part in a procession between Tower Bridge and the Houses of Parliament.

The bridge will lift as a sign of respect and H.M.S Belfast will sound a four-gun salute while on the BT Tower in central London will scroll the message “long may she reign”.