One of pop artist Andy Warhol's silvery white wigs is set to go under the hammer at a Christie's auction next week (22JUN06). The New York memorabilia sale will also feature a phone once owned by Marilyn Monroe and the screen icon's address book, as well as assorted items from Warhol's collection, which are being sold by his nephews. The wig is expected to fetch upwards of $4,000 (GBP2,200).