Madonna's used underwear is being auctioned.

The biggest collection of memorabilia relating to the 'Material Girl' hitmaker will be sold by Julien's Auctions of Beverly Hills on November 7 and among the lots up for grabs is ''the latex mask, waspie, gloves, bra and panties worn with Katy Perry for a 2014 V Magazine cover photo shoot'', which is worth $1,000-$4,000.

Asked if it was ''creepy'' that someone will own Madonna's pants, her publicist Liz Rosenberg told the New York Post newspaper's Page Six column: ''If the shoe fits, then wear them in good health.''

Among the more unusual items up for grabs are the star's diary from 1988, which includes hand-written entries detailing an appearance on 'Late Night with David Letterman' and dates with then-husband Sean Penn, and a signed document relating to the former couple's separation.

Also on sale are costumes the 56-year-old star wore in her movies 'A League of Their Own', 'Evita', and 'The Next Big Thing', negatives and prints of nude pictures Madonna posed for in 1979 - some of which later appeared in Penthouse magazine - and the Marilyn Monroe-inspired red dress, stole and jewellery from her 'Material Girl' video, which are expected to fetch $20,000-$40,000 in the sale.

Madonna's publicist said the singer is currently on vacation with her four children and is unaware the auction - which she will not profit from - is taking place.

She added: ''I do not believe any of what is being auctioned off was in Madonna's possession.

''Designers often supply clothes for shoots that are then returned to the designers.''