Duffy has admitted she is a ‘cheap date’.

The ‘Mercy’ singer confessed it doesn’t take much to get her drunk when she is out with a guy. She said: ‘I get p****d on two glasses of wine. I’m not going to lie. I’m a cheap date.’

The 23-year-old Welsh star – who performed at Radio 1’s Big Weekend music festival in Maidstone, Kent, on Saturday - also revealed she is finally getting used to the fame game.

She explained: ‘At the beginning I was really careful – you know, early to bed – but now I’m used to it I push the boat out when I can. I can get away with four hours sleep but any less than that and it’s bad. It’s day and game over.’

Duffy, who performed a cover of Madonna’s ‘Borderline’ during her set on the main stage, admitted she was terrified about performing a Madonna song during her set.

She added: ‘I put a bit of thought into it. I think if Madonna heard it she would say, ‘Oi, behave, Welsh singer bird.’ ‘