Emma Watson, Jessica Biel, Eva Mendes: These Celebs Are Dangerous!

Be careful what you search for online—particularly if it happens to be the actress who played Hermione in the Harry Potter movies

Too bad Hermione doesn't have a disarming charm to ward off hackers.

Those cyber-security experts at McAfee have named Harry Potter star Emma Watson 2012's Most Dangerous Celebrity. Close behind the 22-year-old thesp in second and third place respectively are Jessica Biel, who took the title in 2009, and Eva Mendes.

McAfee's list is a rather dubious one, as the firm created it as a way to raise awareness of a rapidly growing problem—that is, celebs being used to lure innocent netizens into downloading all kinds of computer viruses, malware and other malicious software that uses personal data to commit fraud—usually when a celeb's name along with "nude pictures" or "free downloads" is typed into a search.

The rest of the top 10 are all women, unsurprisingly, many of them Latina. Selena Gomez came in fourth followed by Halle Berry, Megan Fox and Shakira in fifth, sixth and seventh place. Cameron Diaz, Salma Hayek and Sofia Vergara round things out respectively in eighth, ninth and 10th place.

The only male to crack the top 20 riskiest celebs was comedian Jimmy Kimmel (though most likely not for nude pics).

Several models made the list, with Elle Macpherson, Bar Refaeli and Kate Upton landing at No. 16, 17 and 20 respectively. The winner of 2011's Most Dangerous Celebrity, by the way, was fellow catwalker Heidi Klum.