Leo Blair is the youngest son of the Right Honourable Tony Blair, Prime Minister of the United Kingdom and Cherie Booth QC. He was born on May 20, 2000 at the Chelsea and Westminster Hospital in London.

Leo Blair is the first child to be born to a serving Prime Minister. The Blairs have been very conscious to shield Leo from media scutiny. Tony Blair has refused to confirm whether Leo has received the MMR vaccine, a controversial issue in the United Kingdom.

Despite the Blair's desire to sheild Leo from publicity, he has had photos of himself published with some famous faces including Her Majesty Queen Elizabeth, the Queen Mother and Jacques Chirac, the President of France.

Leo lives at 10 Downing Street, London with his parents and three siblings: Euan Blair, Nicky Blair and Kathryn Blair.