NAKED FERGIE; Duchess bares all for charity book.
THE Duchess of York has become the first senior royal to pose naked - after stripping for a new book.
Fergie, who celebrated her 45th birthday yesterday, wears only a diamond necklace and stilettos as part of a charity photo-shoot.
She bares virtually all to help raise cash for Elton John's charity to combat Aids in Africa.
The snaps were taken by London-born photographer Pamela Hanson.
They are due to appear next May in the book titled Four Inches - after the height of heels models wear.
Details of her strip emerged as mum-of-two Fergie let her hair down at her birthday bash.
Her decision to strip off is even more surprising since she once confessed to hating her body - and has famously struggled with a succession of diets.
Bravely, she even agreed to pose alongside some of the world's most beautiful women - including party companion Kate Moss, Rachel Hunter, and actress Lara Flynn Boyle.
Insiders revealed that she was persuaded to do it by Tamara Mellon, founder of Jimmy Choo shoes.
But a spokesman for the book's London publishers stressed yesterday that "it is all very tasteful".
The last time any member of the royal family took part in a risque photo shoot was Marina Mowatt, Princess Alexandra's daughter.
She fell out with her family after posing in PVC boots, with a tiara and corgis, for a magazine cover.
Meanwhile, Fergie was concentrating on enjoying her birthday with a group of close friends in London.
The occasion included a special performance by the English Chamber Orchestra - a gift from her Hong Kong-based entrepreneur pal David Tang, 50.
Twenty-two musicans performed the private concert - more than double the number of guests, who also included publishing heir Sir Jocelyn Stevens. One of the musicians said: "She really seemed to enjoy it."
But Fergie may be in for a shock when she finds out who is handling publicity for the book - ex-husband Prince Andrew's former girlfriend Arabella Bodie.
Arabella, 32, dated the Prince in 2001 and now has a top PR job with the Jimmy Choo empire.
PALS: Fergie and Kate yesterday