Erm, yep: that's pretty much how the internet works. A popular term will always be exploited by malicious hackers (or hacker wannabes) who'll set up pages which aren't what they appear, with the purpose of infecting your computer, extracting your personal data, or worse. The most popular targets for these cybervillains, however, change over time; last year it was Brad Pitt, and this year, according to McAfee, it's Jessica Biel.
More precisely, if you Google Jessica Biel, you have a one-in-five chance of landing at a website that contains some sort of online threat: spyware, phishing, viruses, trojans, spam, and the like.
The rest of the list looks like this: Beyonce is in the second place, with "Beyonce ringtones" being a particularly dangerous term to search, Jennifer Aniston came in third place (don't search for "Jennifer Aniston screensavers"), followed by Tom Brady, Jessica Simpson, Gisele Bundchen, Miley Cyrus, Megan Fox, Angelina Jolie, and Ashley Tisdale. Brad Pitt came in 10th place this year; sorry Brad, it looks like you're getting old.