Clinton: 'Congratulations from across the pond'

Former US Secretary of State Hillary Clinton has tweeted her congratulations to the Duke and Duchess of Cambridge:

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Congratulations from across the pond to the Duke and Duchess! Wishing you the best of luck and a bit of advice: It Takes a (Royal) Village!

Watch: News of royal birth dominates US headlines

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World celebrates prince's birth

The royal couple have been sent messages of congratulation from around the world. US President Barack Obama called the birth a "joyous occasion".