Fifty Shades of Cringe: 'I don't really want to talk to my mother about S&M', says Victoria Beckham

Victoria Beckham has revealed she has been left red-faced after buying her mother a copy of the steamy bestseller Fifty Shades Of Grey.

EL James's trilogy of novels - dubbed mummy porn - has become a publishing phenomenon, selling millions of copies.

Beckham told the US edition of Glamour Magazine that she was halfway through the second book.

She said: "I even bought my mum the book. But every time she tries to engage in conversation about it, I kind of dodge the subject. I don't really want to talk to my mother about S&M."

The star, who has three sons and a daughter with footballer husband David, said she would not rule out having another child.

She said: "It's a juggling act - a career, family, a husband who's busy. But I'd never say never."