Alex Rodriguez was spotted flirting with “Real Housewives of New York” star Kelly Bensimon at Wall in Miami the other night. At the Art Basel party hosted by Vito Schnabel, Alex Dellal and Stavros Niarchos, “He had his arm ’round Kelly and they were flirting,” a witness told us. The next day the two were seen browsing art at the Convention Center. A different source said, “While Alex was recently seen with Cameron Diaz again, they’re not back together. He is single.” Reps for A-Rod and Bensimon didn’t get back to us.