Hillary Clinton, the US Secretary of State, has been left red faced after mistakenly sending a birthday message to the Queen a week early. An official statement from the US foreign policy chief paid tribute to the "Queen’s life and legacy,” despite the fact that the Monarch does not celebrate her official birthday until next weekend. The diplomatic faux pas, sent on behalf of President Barack Obama and the American people on Friday, also celebrated the "special relationship" between the British and US governments.