Millions of revellers raised pints of the world's most famous stout on Thursday to toast the birth of Guinness.
A raft of global celebrations marked Arthur's Day and 250 years since the Irish brewer went into business.
Patrons raised their glasses at 17.59 to celebrate the historical signing of its lease in 1759, before Tom Jones, Estelle, Kasabian, Natalie Imbruglia and former Destiny's Child band member Kelly Roland rocked the Irish capital.
Model and socialite Jasmine Guinness, her father Patrick and siblings were among the family members overseeing the celebrations at Guinness HQ.
Cat Deeley and Boyzone's Ronan Keating hosted the main concert at the Guinness Storehouse, which was streamed live to thousands of pubs throughout the UK on the day.
A host of artists also performed at celebrations in 28 intimate pub venues across Dublin and in Lagos, Cameroon and Kuala Lumpur.
Mr Guinness's son Patrick said descendants from the famous clan had spread too far across the world to try and make the party a family event.
"It is a good thing, but there is so many of us now that it's not as though we are having a family dinner party somewhere," said the historian. "We are very glad they are doing it."
The Guinness brand, now owned by multinational drinks giant Diageo, is recognised around the world.
The brewery was founded after Arthur Guinness secured a 9,000 year lease on the St James's Gate site for the annual sum of £45.
At first, Guinness was a Dublin tipple but Arthur used the growing network of canals to send it all over the country.
By 1886, St James's Gate was the largest brewery in the world.
The company dubbed September 24th Arthur's Day, and more than 11,000 people on social networking site Facebook called for Arthur's Day to become a national annual holiday.
Guiness facts:
- Arthur Guinness set up his first brewery in Leixlip, Co Kildare, in 1756 after he was left a £100 inheritance by his godfather, Archbishop Arthur Price.
- He later handed the business to his brother and, in 1759, signed a 9,000 year lease on the St James's Gate Brewery for an annual fee of 45 pounds.
- Ten million glasses of Guinness are now enjoyed around the world every day.
- It is made from barley, hops, yeast and water that flows from the Wicklow Mountains.
- Poured at an angle of 45 degrees, it takes 119.5 seconds for the perfect pint to settle.
- Six generations of the Guinness family were involved in the brewery management until 1986.
- In 1936 the first overseas Guinness brewery was opened in London, followed by four more by Nigeria, Malaysia, Cameroon, and Ghana.
- Guinness is now brewed in almost 50 countries and sold in over 150.
- The ancient Irish Harp symbol was initially used as a symbol for Guinness, registered in 1876, and later adopted by the Irish Government as the official symbol.
- The Guinness company also produced the Guinness Book of Records, which originated in 1955 when a bar debate could not be settled with existing reference books.
- The Gravity Bar at the Guinness Storehouse is the highest bar in Dublin located 46 metres off the ground.
- Heirs to the famed Guinness family, including model and socialite Jasmine Guinness, will be overseeing the star-studded celebrations of its 250 anniversary at Guinness HQ.
- Diageo, which now owns the brewery, plans to locate a new brewery back in Leixlip.
© Press Association