Queen Elizabeth II and members of the royal family gathered on Buckingham Palace's balcony to watch a flypast by the RAF which included the Red Arrows, two Spitfires and four helicopters. Kate Middleton's daughter, Princess Charlotte, who was on the balcony for the first time, appeared alarmed by the noise of the aircraft and covered her ears.

The Queen is celebrating her official landmark birthday over the next three days in a series of fun-filled festivities. Her coronation was on 2 June 1953, making the Queen the longest-serving monarch in British history. She has become a much-loved and respected figure across the globe.

Though she was born on 21 April, 1926, and has already reached her 90th birthday milestone, Her Royal Highness enjoys two birthdays a year, and the British weather is to blame.

Since 1748, the monarch's official birthday has been marked by a parade called Trooping the Colour – previously held on the king or queen's actual birthday.

However, when King Edward VII – who reigned from 1901 to 1910 – was born on November 9, 1841, he celebrated officially in May or June because there was less chance of it being rainy or cold during the outdoor event.

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A new picture released by Buckingham Palace on June 10, 2016 to mark the Queen's 90th birthday, shows Queen Elizabeth II with her husband, The Duke of Edinburgh, and was taken at Windsor Castle just after Easter Annie Leibovitz/Buckingham Palace via Getty Images

Unfortunately for the Queen, London is expected to be hit by showers all weekend, in true British summer style. There will however be a silver lining to Saturday's rather grey clouds, because it will be mild at 21°C. Sunday will see temperatures of approximately 19°C with lighter showers.

IBTimes UK rounds up the Queen's big birthday weekend including when and where to watch the televised celebrations; so get your Victoria sponge and pots of tea at the ready as the regal revelries get under way.

The Queen's 90th Birthday: The National Service of Thanksgiving

Friday 10 June BBC1 9.30am – 12.15pm

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Queen Elizabeth II and Prince Philip, Duke of Edinburgh arrive for a Service of Thanksgiving for Queen Elizabeth II's 90th birthday at St Paul's cathedral on 10 June 2016 Stefan Rousseau - WPA Pool/Getty Images

The weekend festivities kicks off the worldwide celebrations to mark the Queen's 90th birthday with a National Service of Thanksgiving broadcast live from St Paul's Cathedral. Her Majesty will be accompanied by her husband Prince Philip, Duke of Edinburgh, who is celebrating his own 95th birthday today (10 June), and senior members of the royal family including the Duke and Duchess of Cambridge. It is presented by Huw Edwards and Kirsty Young, and features an anthem composed by Judith Weir and sung by the cathedral choir.

The Queen's 90th Birthday: The National Service of Thanksgiving – Highlights

Friday 10 June BBC2 7pm – 8pm

If you missed the aforementioned live coverage of the St Paul's service, tune into BBC2 at 7pm where you'll be filled in on the key moments from the event, also hosted by Edwards and Young.

Trooping the Colour 2016

Saturday 11 June BBC1 10.15am – 1.05pm

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Queen Elizabeth II inspects The Foot Guards during Trooping the Colour at The Royal Horseguards on June 14, 2014 Stuart C. Wilson/Getty Images

Now the real party can start. Following the prim and proper National Service of Thanksgiving at St Paul's Cathedral, we can get our picnic baskets, plastic ponchos and brollies at the ready for Elizabeth II's Birthday Parade. The merriment will unfold in earnest in front of a raucous, giant crowd as the Queen and Duke of Edinburgh travel from Buckingham Palace to Horse Guards Square. There, they will behold a display of pageantry comprising more than 1,400 officers and soldiers, 400 musicians and 200 horses. The royal family will then appear on the Palace balcony with an RAF flypast. Huw Edwards and Clare Balding will present the live coverage of the pageantry and spectacle.

The Queen's 90th Birthday: The Patron's Lunch

Sunday 12 June BBC1 1.15pm – 4.15pm

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Patron's Lunch will comprise a big street party on the Mall in London Ross Kinnaird/Getty Images

Kirsty Young presents live coverage of the Patron's Lunch in St James' Park, London, which is the third event to celebrate the Queen's 90th birthday over the course of the weekend. It's a good old-fashioned quintessential British street party to end all street parties, and will take place across the half-a-mile length of the Mall. It will be lined with chairs and tables as 10,000 people celebrate the Queen's patronage of more than 600 charities and other organisations. New funds will be raised as the carnival-style gathering unfolds with plenty of cake and jammy scones in the luxury hamper-style lunch over the three-hour broadcast.

Queen at 90: Gun salutes in Edinburgh and Hyde Park mark monarch’s birthday IBTimes UK