Watch the full interview with the Prime Minister from tonight's programme.
Mr Cameron confirmed that Wales will host the 2014 Nato Summit, an event that he described as "a great moment for Wales to advertise its modern and economically brilliant face to the world".
He also said that an announcement on devolved powers for Wales will be made on Friday.
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The Neath-born singer is only the third person to be honoured, following fellow singer Bryn Terfel and cycling star Sir David Brailsford.
After a soggy start to the new week things are improving out there for many with just a few scattered and sometimes heavy showers possible.
Astronaut Steve Swanson has been working with schoolchildren from across South Wales, as part of a special space science project.