London - Britain's Queen Elizabeth II, who got on splendidly with the Obamas, has let it be known that she was not amused at the loud behaviour of one of her other G20 guests - Italian President Silvio Berlusconi.

Footage emerged on YouTube Friday showing the 82-year-old monarch expressing mild irritation at the Italian for shouting "Mr Obama" after a group photograph was taken following a palace reception for G20 leaders in London Wednesday.

"What is it? Why does he have to shout?" said the queen, raising her arm slightly as she turned to the US President standing next to her.

In contrast to her obvious irritation, the queen displayed an air of harmony and personal closeness during her private encounter Wednesday with Barack and Michelle Obama, with pictures showing the monarch and the US First Lady putting their arms around each other.

After Obama's election last November, Berlusconi was widely criticized for describing the new US President as being "young, handsome, and tanned."

London's Financial Times newspaper Friday splashed on its front page a pre-summit photograph showing the Italian leader joking and smiling as he puts his arms round Obama and Russian President Dmitry Medvedev, as Obama gives a "thumbs up" sign.