The singer, who recently worked with Lady Gaga on the Gnomeo & Juliet soundtrack, has praised her great work ethic.

"I love her, she's absolutely amazing. We've become friends. What I like about the Gaga most is that she's amazingly polite and respectful to everyone around her," Elton John told The Mirror.

He added: "What I loved most about John Lennon is that he was like that. He once gave my mum a lift to the airport and came to my agent's wedding."

"The GaGa is like that. But the greatest thing about her is that she manages to let everyone think they know everything about her but no-one knows anything."

Meanwhile, Sir Elton John has launched an attack against British pop music, singling out the likes of Cheryl Cole and The Saturdays.

(by Holly Frith)