Queen Elizabeth turns 91 Friday - Cleveland 19 News Cleveland, OH

Queen Elizabeth turns 91 Friday

Queen Elizabeth II is the oldest and longest-reigning monarch in British history. (Source: CNN) Queen Elizabeth II is the oldest and longest-reigning monarch in British history. (Source: CNN)

(CNN) - Britain's longest-reigning monarch turns 91 Friday.

Buckingham Palace marked her birthday by tweeting a photo of Queen Elizabeth II at her christening when she was 1 month old.

Other Twitter accounts associated with the British royal family also shared old pictures of the queen and her family.

Queen Elizabeth typically celebrates her birthday in private, but there is a public "official birthday" celebration for the monarch the second Saturday in June.

The queen marked her 65th anniversary as Britain's reigning monarch in February. She is also the oldest monarch in British history.

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