Madonna's love letters and erotic answering machine messages to an ex-boyfriend are up for sale in New York City.
The Material Girl's material is among nearly 500 personal celebrity items including Jimi Hendrix's $US1 ($NZ1.54) performance contract and Muhammad Ali's training robe being offered in an online auction.
Madonna faxed love letters to her then-boyfriend Jim Albright and left naughty messages on his answering machine in the early 1990s. The messages are on two micro-cassette tapes estimated to sell for up to $US40,000.
The Gotta Have It! auction house says the 1965 contract between Hendrix and PPX Enterprises is believed to be his first.
