Cameron Diaz has a new beau. New York's Daily News reports he is actor Jared Leto, who is playing the lead role in the movie version of Brett Easton Ellis' novel "American Psycho," which is currently shooting in Toronto. Diaz is making "On Any Given Sunday" for director Oliver Stone in Miami. The News says Cameron flew up to see him last weekend and "they just couldn't stop flirting with each other" in a restaurant, a source squealed. Diaz's last serious steady was Matt Dillon, her "Something About Mary" co-star. They broke up last year.