I found this article regarding Fergie's purse.
"Spotted: Stacy Fergie Ferguson was spotted by the paparazzi yesterday on the streets of Hollywood while out-and-about stopping at all the hotspot boutiques with her purse that doubles as a punk-chic weapon - the medieval looking spiky Mulberry for Giles collaboration designer Mace keyring.
The ten piece accessory and handbag line collaboration between Mulberry and Giles took place a few months back and so far I havent really seen anyone sporting a purse or accessory from this collection, with the exception of the ferg."