Hannah Montana mania has taken over London! 14-year-old Miley Cyrus, who plays the Disney character, was making the appearance to sign her new DVD at the flagship HMV store on Oxford Street in London and was surprised by the thousands of screaming fans that had been camped out since in 5 AM. So many people turned up that HMV has confirmed that this was the stores biggest signing event, ever. I can't even begin to imagine what thousands of 10-year-old girls screaming sounds like. This is going to give me nightmares. Miley is daughter of mulleted country and western singer Billy Ray Cyrus who is currently on "Dancing With The Stars." More pics after the jump!