This was the latest instance of the two being seen in each other's company since their break-up in June, reported The New York Daily News.
Smart, 27, attended an event hosted by Nick Jonas on February 6 night, and the 45-year-old singer was waiting for him in his car when he left.
The former couple were then seen at Hotel Cafe in Hollywood and Smart had his hand on Lopez's waist as the two walked by photographers.