Worth: £6m

This Welsh wonder really puts the 'class' into classical music. At 26, she's already released four top 10 albums. She has sung for British troops in Kosovo and Iraq, and performed everywhere from the Sydney Opera House to the Royal Albert Hall. Still, she can't resist nipping back to Wales to sing the national anthem at top footie matches. Not bad for a girl who grew up in a council house in Neath.

Impress her by: Breaking into your finest falsetto.