Singer Justin Timberlake and his ex, actress Cameron Diaz, have reportedly been seen flirting on the set of their upcoming movie Bad Teacher.

The couple’s four-year relationship ended in 2007. Timberlake later started dating actress Jessica Biel. However, both Justin and Cameron surprised The film crew when.

They were seen laughing and flirting on the set in Los Angeles, reports The New York Post. "They are acting like a couple of teenagers, constantly laughing and joking with each other. There's a lot of good chemistry there," a spy said.