A black velvet dress that belonged to Whitney Houston and a pair of earrings she wore in “The Bodyguard” will be sold to the highest bidder next month. Celebrity auctioneer Darren Julien said Sunday the pieces and other Houston items became available after the singer's unexpected death on Feb. 11 and will be included among a long-planned sale of Hollywood memorabilia such as Charlie Chaplin's cane, Clark Gable's jacket from “Gone With the Wind” and Charlton Heston's staff from “The Ten Commandments.” Julien said celebrity collectibles often become available after their namesakes die. “It proves a point that these items, they're an investment,” Julien said. Houston fans and other collectors can bid online, by phone or in person during the “Hollywood Legends” auction on March 31 and April 1. Lots will be shown during a free public exhibition beginning March 19 at Julien's Auctions in Beverly Hills, Calif., just blocks from the Beverly Hilton Hotel, where Houston died at age 48. __