Britain's Queen Elizabeth II on Tuesday night appointed David Cameron as new British Prime Minister and empowered him to form a new government following the resignation of Labour Prime Minister Gordon Brown. Cameron thus becomes the youngest British prime minister in nearly 200 years.

Cameron was born on Oct. 9, 1966 into a rich family in London. His father is a stock broker and his mother a magistrate. He studied at the elite Eton College and Oxford University, majoring in philosophy, politics and economics at Oxford.

Cameron was elected as the Member for the Oxfordshire constituency of Witney in 2001 and the Member of the shadow cabinet of the Conservatives in 2003. On Dec. 6, 2005 when he was 39 years old, he was elected as Conservative leader, in whose capacity he expressed the hope to reform the Tory.

During the general election campaign, Cameron's slogan was "vote for change", which well met the voters' desire for change.

After taking office, Cameron said he would work together with Liberal Democrats Party leader Nick Clegg to put aside party differences and work hard for the common good and the national interest.

"I aim to form a proper and full coalition between the Conservatives and the Liberal Democrats. I believe that is the right way to provide this country with the strong, the stable, the good and decent government that I think we need so badly," he said.

He noted that Britain is faced with some deep and pressing problems -- "a huge deficit, deep social problems, a political system in need of reform". He also promised to be "honest about what government can achieve" and pledged to build a more "responsible society," saying Britain's best days lie ahead.

Cameron, as the head of the British Conservative party delegation, visited China on Dec. 19, 2007.