Madonna's letter and messages are up for sale

Madonna's love letters and erotic answering machine messages to an ex-boyfriend are up for sale in New York.

The letters and micro cassette tape messages, to her then-boyfriend Jim Albright in the early 1990s, are estimated to sell for up to 40,000 dollars.

The Queen of Pop's material is among nearly 500 personal celebrity items being offered in an online auction ending on August 5.

Jimi Hendrix's one-dollar performance contract and Muhammad Ali's training robe are also up for sale.

The Gotta Have It! auction house said the 1965 contract between Hendrix and PPX Enterprises is believed to be his first.

Ali trained in the terry cloth robe for his third fight against Ken Norton in 1976 at Yankee Stadium. Ali won.