President of the United States Barack Obama (L) and First Lady Michelle Obama (R), meet with Prince William and the Duchess of Cambridge, at Buckingham Palace in London, Britain, 24 May 2011. Obama arrived late on 23 May, a day ahead of schedule, in order to avoid potential travel disruptions caused by the ash cloud from an erupting volcano in Iceland. Obama arrived in Britain for a three-day state visit, declaring the UK-US partnership 'an essential relationship for us and for the world'. EPA/CHARLES DHARAPAK UK AND IRELAND OUT - NO SALES NO SALES
First Lady of the United States Michelle Obama speaks to the Duchess of Cornwall, as they leave Winfield House, the official residence of the US Ambassador, in Regent's Park, central London, Britain, 24 May 2011. Obama arrived late on 23 May, a day ahead of schedule, in order to avoid potential travel disruptions caused by the ash cloud from an erupting volcano in Iceland. Obama arrived in Britain for a three-day state visit, declaring the UK-US partnership 'an essential relationship for us and for the world'. EPA/DOMINIC LIPINSKI UK AND IRELAND OUT - NO SALES NO SALES
President of the United States Barack Obama speaks to the Prince of Wales (L), as they leave Winfield House, the official residence of the US Ambassador, in Regent's Park, central London, Britain, 24 May 2011. Obama arrived late on 23 May, a day ahead of schedule, in order to avoid potential travel disruptions caused by the ash cloud from an erupting volcano in Iceland. Obama arrived in Britain for a three-day state visit, declaring the UK-US partnership 'an essential relationship for us and for the world'. EPA/DOMINIC LIPINSKI UK AND IRELAND OUT - NO SALES NO SALES
President of the United States Barack Obama (2-L) and first lady Michelle Obama (L) are greeted by Queen Elizabeth II (2-R) and The Duke of Edinburgh as they arrive at Buckingham Palace, in central London, Britain, 24 May 2011. Obama arrived late on 23 May, a day ahead of schedule, in order to avoid potential travel disruptions caused by the ash cloud from an erupting volcano in Iceland. Obama arrived in Britain for a three-day state visit, declaring the UK-US partnership 'an essential relationship for us and for the world'. EPA/TOBY MELVILLE UK AND IRELAND OUT - NO SALES
US First Lady Michelle Obama (R), meets with Catherine, Duchess of Cambridge, at Buckingham Palace in London, Britain, 24 May 2011. Obama arrived late on 23 May, a day ahead of schedule, in order to avoid potential travel disruptions caused by the ash cloud from an erupting volcano in Iceland. Obama arrived in Britain for a three-day state visit, declaring the UK-US partnership 'an essential relationship for us and for the world'. EPA/TOBY MELVILLE UK AND IRELAND OUT - NO SALES
US President Barack Obama (2-L) and First Lady Michelle Obama (2-R) during the ceremonial welcome by Queen Elizabeth II (L) and the Duke of Edinburgh (R), in the garden of Buckingham Palace, central London, Britain, 24 May 2011, as part of the Obama's state visit to the UK. EPA/ANTHONY DEVLIN UK AND IRELAND OUT NO SALES
President of the United States Barack Obama speaks to the Prince of Wales (L), as they leave Winfield House, the official residence of the US Ambassador, in Regent's Park, central London, Britain, 24 May 2011. Obama arrived late on 23 May, a day ahead of schedule, in order to avoid potential travel disruptions caused by the ash cloud from an erupting volcano in Iceland. Obama arrived in Britain for a three-day state visit, declaring the UK-US partnership 'an essential relationship for us and for the world'. EPA/DOMINIC LIPINSKI UK AND IRELAND OUT - NO SALES NO SALES
