The American President swept into the south today for a special birthday lunch with the Queen.
Barack Obama, accompanied by the first lady - arrived by helicopter at Windsor Castle. They were greeted by her majesty and the Duke of Edinburgh who were waiting in the Berkshire rain.
But Mr Obama also flew straight into a political storm as he used his last official visit as president to urge the UK to stay within the EU.
With more from Windsor, here's Divya Kohli.
Her Majesty The Queen is ninety years old today, and Windsor in Berkshire is the focus of the celebrations. Queen Elizabeth II will go on a walkabout around the town, accompanied by her husband, the Duke of Edinburgh.
The Queen will also unveil a plaque marking 'The Queen's Walkway', a 6.3km self-guided walking trail connecting 63 points of significance in the town of Windsor. The Walkway symbolises the moment at which Her Majesty became Britain's longest reigning monarch, after more than 63 years on the 9th September 2015.
Celebrations will also take place in June to mark Her Majesty The Queen's official birthday.
Thousands of people have been applying for free tickets to help celebrate the Queen's birthday in Windsor.
Tickets for the celebration on the Long Walk in May sold out within hours in November. But a ballot of 5,000 tickets opened to the public yesterday.
The Long Walk will offer the opportunity to be involved in a pre-performance party on the final night of the event and to watch a live-screening of the ITV broadcast from the iconic Long Walk.
The show will tell the remarkable story of The Queen's life encompassing a reign spanning more than 60 years, starting from when she was born in 1926, through World War Two, to The Coronation in 1953.
Applications for the ballot can be completed online by filling out a short form, which can be found at www.hmq90.com or they can be applied for in writing to: Celebration on The Long Walk, The Old Booking Hall, Windsor Royal Shopping, Thames St, Windsor SL4 1PJ.
It is being billed as a huge party for the Queen - a star studded show in the grounds of Windsor Castle, to mark her Majesty's 90th birthday.
Now it has been revealed the event in May, which will be broadcast live on ITV, will be hosted by Britain's most popular TV duo Ant and Dec. As Rachel Hepworth reports, preparations are well under way.
The interviewees are: Simon Brooks-Ward, Director of the Queens's birthday celebrations; the singer Katherine Jenkins; Pau Roach, Windsor & Eton town manager; and Julia White, Windsor Visitor manager.
A team of seven model makers are beginning a stock check of 80 million bricks at Legoland in Windsor.
They will be spending their time making essential repairs and conducting a careful ‘brick count’ to assess stock levels.
Our Model Makers not only have to make sure all of the models our guests get to enjoy on the resort - all 80 million bricks wort - are in great shape, it’s also their job to ensure there’s always enough bricks in the Lego bank to make repairs and build new models when we need to
The team will take five days to complete their stock check and brick count.
Thames Valley Police is continuing to appeal for the public’s help in tracing a missing teenager from Windsor.
Victoria Munn, aged 16, was last seen at 11am on 24 July at her home in Windsor. She told her family she was going to try to find a job and was then due to meet up with her friends however did not attend.
Thames Valley Police is releasing CCTV images of Victoria at Maidenhead railway station at around 10.30pm on Saturday (25/7).
Victoria is white, 5ft 4ins, slim and has long straight dyed blonde hair. She is thought to be carrying a black case which contains a saxophone.
She is shown in the images to be wearing a cream or white baseball cap, a dark long sleeved top with a cream or white collar, grey tracksuit trousers, dark coloured shoes and was carrying a blue backpack.
Victoria has links to Windsor town centre and it is believed she has travelled to Portsmouth in Hampshire.
Detective Chief Inspector Jim Reeves said:
“Victoria has been missing for over a week and we are concerned for her welfare. It is believed she has travelled to Portsmouth and may be in the company of older people. As she is believed to have her saxophone with her, she may be busking. I would ask that anyone who sees anyone matching her description please contacts police as soon as possible. If you see this appeal Victoria, please get in touch with the police to let us know you are safe."
Anyone with any information about Victoria’s whereabouts, please contact the 24-hour Thames Valley Police enquiry centre on 101, quoting URN 956 29/7.
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Thames Valley Police is appealing for the public’s help in tracing a missing girl from Windsor.
Victoria Munn, aged 16, was last seen at 11am on 24 July at her home in Windsor.
She told her family she was going to try to find a job and was then due to meet up with her friends however did not attend.
Victoria is white, 5ft 4ins, slim and has long straight dyed blonde hair. She was last seen wearing a black hooded top which had “Windsor Music School” on the back. She may also be wearing a pair of black boots with floral print . She is thought to be carrying a black case which contains a saxophone.
Victoria has links to Windsor town centre and it is thought she may be in the Portsmouth area of Hampshire.
“We would like to speak to anyone who has any information about Victoria’s whereabouts or has seen anyone matching her description. She may be busking with her saxophone so if anyone sees her, please contact police. If you see this appeal Victoria, please get in touch with the police to let us know you are safe.”