What was Alex Rodriguez most grateful for this Thanksgiving? Could it be hanging with a hot, A-list blonde who understands the phrase "casually dating"? Maybe so. The New York Yankees slugger didn't look to be pining for Cameron Diaz following their swimsuit-attired togetherness over the holiday weekend. "While Alex was recently seen with Cameron Diaz again, they're not back together," a source tells the New York Post. "He is single." And mingling. While Diaz promotes "The Green Hornet" in Europe," Rodriguez is making the scene in Miami. A spy tells the paper that a flirty A-Rod had his multimillion-dollar arm around super-sinewy "Real Housewives of New York" brunette Kelly Bensimon during a recent night out at a Miami hot spot. Meanwhile, E! Online reports he attended a fashion shindig on Saturday night and chatted up "an insanely gorgeous, Brazilian-looking model," although a rep for the party says he "ended up leaving early and alone."