Caroline Anning from the charity Save the Children has warned the situation in South Sudan is similar to the east African famines in the 1980s.
Speaking to ITV News' Dan Rivers she said: "If it continues and we can't get the help we need, we could be looking at a catastrophic famine."
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The royal told GQ Magazine: "I would love her to have met Catherine and to have seen the children grow up."
Police said they were called to an incident at Hamerton Zoo in Cambridgeshire but gave no further details apart from no animals escaped.
A man's body has been discovered in the sea off the Kent coast.