From PC World’s “Britney Spears Ranked Top Virus Celebrity“:
Researchers combed through the seven years of virus-laden messages stored in Panda’s malware database to determine which celebrities most often had their names involuntarily used in association with malicious spam. …
The top ten list of celebrity virus rankings (in descending order) is: Britney Spears, Bill Gates, Jennifer Lopez, Shakira, Osama Bin Laden, Michael Jackson, Bill Clinton, Anna Kournikova, Paris Hilton, and Pamela Anderson.