Sasha Obama celebrates birthday on 'Harry Potter' set

US First Lady Michelle Obama celebrated her daughter Sasha's birthday with the cast and the crew of Harry Potter.

During her visit to London, Michelle took her daughters Malia and Sasha to the film's set in Neasden, in north west London, where they reportedly had a party with cast and crew in the Great Hall.

The Obamas have been in London this week after travelling to Europe for the D-Day anniversary commemorations with President Barack Obama, who flew back to Washington without them.

Michelle also took her daughters to the Lyceum Theatre near Covent Garden on Tuesday night to watch The Lion King.

On Monday night they visited Downing Street and the Houses of Parliament before finishing in an upmarket London pub - The Audley in Mayfair - for fish and chips.

"We were all speechless when they walked in. I couldn't believe it. But they were all very friendly. Smiling and laughing," the Telegraph quoted Cintia Pinto, 24, who served Mrs Obama, as saying.

"They made us feel calm. The girls were so sweet and polite. They thanked us every time we brought them something. It was a real honour," Pinto added.