Australia's Prime Minister Kevin Rudd and his New Zealand counterpart John Key have welcomed the arrival of the royal baby.
Mr Rudd said it was a time for "rejoicing", while Mr Key said it was a "momentous day" for the Duke and Duchess of Cambridge.
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A four-year-old boy is among 20 people to have died in some of the worst flooding West Virginia has seen.
The heavy showers will ease off this weekend.
Labour MPs are attempting to build a consensus for a single challenger to Corbyn, while the big game in the Tory Party is Stop Boris.