A JK Rowling book measuring just one inch high has sold for £11,000 at a charity auction at Sotheby's, London.
Rowling added pictures to accompany her tiny Potter's guide
Her guide to everything Harry Potter needs for life at Hogwarts matgical school was the third-highest lot.
The auction, set up by Tatler magazine, asked 24 celebrities to fill a mini book with whatever they liked.
Muhammad Ali's work, including a sketch of boxing rival Joe Frasier, got the highest bid of £17,000. Paul McCartney's effort made £13,000.
The former Beatle filled his book with handwritten lyrics to Hey Jude.
Rowling's book included pictures of Harry's broomstick, spectacles and hat.
Madonna drew the US flag and lyrics to her song American Life, which fetched £8,500.
David Hockney's book, which included nine sketches of Yorkshire, fetched £9,500, while fellow artist Tracey Emin's love poems went for £5,500.
Gerald Scarfe's cartoon drawings of 16 Prime Ministers and US Presidents, titled Those Who MIsled Us, went for £10,000.
The money raised is going towards the 999 Club, a homeless charity in Deptford, south London.