As one of Hollywood's greatest sex symbols, she was known to have a turbulent private life.Now, Marilyn Monroe's love letters - and bizarrely, one of her bras - are being put up for auction in Beverly Hills, California.The letters, penned by the actress and her lovers, including playwright Arthur Miller and baseball great Joe DiMaggio, are among 300 items to go on sale as part of 'Marilyn Monroe's Lost Archives'.