Barack Obama interrupted by Happy Birthday song

Last updated at 11:10
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Crowd sings Happy Birthday to President Obama

It's not the done thing to interrupt the President of the United States, but we think Barack Obama might not have minded this time.

During a speech at a school in the state of Arizona, Mr Obama was interrupted by a woman shouting "Happy Birthday Mr President".

The big crowd then started singing 'Happy Birthday' to him.

He turned 52 on Sunday and joked about his wife: "Michelle says that I don't look a day over 51".