Adele finds it funny that American people think she's 'posh' and knows the British royal family.

"American people think I am posh even though I am really not. They think I have a very British accent, as in: 'Do you know the queen?'' she quipped in an interview.

'I just laugh at them. In England I am thought of as common as muck. I'd like to know a couple of the royals, though. I'd love a night out with Prince Harry, he seems like a right laugh. I love Kate Middleton, she's brilliant. And I love William."

Adele was invited to perform at last year's Royal Variety Performance in England.

"When I called my nan to tell her, she was so excited because she's 65 and the queen is her imaginary best friend,' she said. "So I was really dressed up in the dress that she picked for me. It looked like I was trying to be a princess."

Adele has been dogged by ill health of late.

The 23-year-old star has revealed the embarrassing voice exercises given to her by her vocal coach after she experienced haemorrhage on her vocal cords earlier this month.

" I have to sing my songs through a straw to get my diaphragm going and I have to sing things like Happy Birthday and the Grand Old Duke Of York. It's so embarrassing."