Looking for Beyonce? watch out risky cybercriminals!

Pitt and singer Justin Timberlake are the most dangerous men to search for on the Internet, while Beyonce and Heidi Montag, the star of the reality television show "The Hills", top the list for women.

Other celebrities on McAfee's most dangerous list include singers Mariah Carey, Rihanna and Fergie and film stars Angelina Jolie, Jessica Alba, Cameron Diaz and George Clooney.

Green said Americans' obsession with following celebrities' lifestyles make them obvious targets.

"We have to take precautions in casually navigating the Web since many subtle sites may be rife with malware for consumers' computers," he said, referring to software designed to infiltrate computer software without the consent of the owner.

Malware includes viruses, worms and spyware, which are computer programs that report back to a third party a user's activity and Web-surfing habits.

The reasons for planting spyware range from simple marketing purposes to more serious things like stealing files or passwords used to access sensitive financial information.