"I'm single right now, thank you," she said.
Lopez and Smart, a 27-year-old dancer and choreographer, dated for more than three years before splitting up in June 2014. They remained friendly after their breakup and have since then been spotted hanging out together several times.
She and Smart were most recently photographed together on Saturday night, after the recent PDA incident; they were spotted leaving an after party following the 2015 Kids' Choice Awards.
At the ceremony, Lopez had served as a presenter and got to command the epic sliming of host Nick Jonas, who won the award for Favorite Male Singer and also performed at the event. Smart worked as the pop star's creative director.
He talked about his own love life last month at the premiere of Home. Accompanied by mom Shawna Lopez, he had attended the event to support Lopez, who stars in the animated movie. She arrived at the event with her and ex-husband Marc Anthony's 7-year-old twin son and daughter, Max and Emme.
Smart told E! News at the premiere that he and Lopez were "very good friends" and that he was "single."