Pop superstar Britney Spears is asking fans to turn paparazzi in a bid to win a signed iPod. The Toxic singer, who has become a number one target for Los Angeles' top photographers, is sending emails to fans asking them "to sneak up on their friends and photograph them." She writes: "Share what happens to you when the clock strikes 12... Where are you? Who is with you? "Savour every last detail and when you think you have it down, recreate that perfect moment and capture it as best you can in a digital photograph." However, Spears warns fans not to recreate her recent infamous 'panty-less' paparazzi shots. She adds, "No images containing nudity, obscenity or violent depictions are permitted." The competition is to promote Spears' new Midnight Fantasy fragrance.